Add Namespace Field. (airbytehq#2704)

Add namespace field to the Airbyte Stream in preparation to propagate a source defined namespace to the Destination.

This namespace field is then consumed as the destination schema the table is written to.

This only applies to JDBC destinations.

This is Steps 1 - 4 of the namespace tech spec, seen at https://docs.google.com/document/d/1qFk4YqnwxE4MCGeJ9M2scGOYej6JnDy9A0zbICP_zjI/edit.

Some minor refactoring and commenting as I go.
* Remove unnecessary test classes as they match Integration tests in terms of what is being tested. They have no real value since the corresponding integration test can be run locally without additional credentials. The main value the classes brings is letting us run tests without building the docker image (the integration tests require doing so). however I feel this benefit is not worth the additional maintenance cost.
* Centralise DataArgumentProvider into it's own class for easier maintenance and usability.

airbyte-commons/src/main/java/io/airbyte/commons/functional/CheckedBiFunction.java

@@ -0,0 +1,31 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 Airbyte
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package io.airbyte.commons.functional;
+
+public interface CheckedBiFunction<First, Second, Result, E extends Throwable> {
+
+  Result apply(First first, Second second) throws E;
+
+}

airbyte-integrations/bases/airbyte-protocol/airbyte_protocol/models/airbyte_protocol.py

@@ -137,6 +137,10 @@ class Config:
         None,
         description="If the source defines the primary key, paths to the fields that will be used as a primary key. If not provided by the source, the end user will have to specify the primary key themselves.",
     )
+    namespace: Optional[str] = Field(
+        None,
+        description="Optional Source-defined namespace. Currently only used by JDBC destinations to determine what schema to write to. Airbyte streams from the same sources should have the same namespace.",
+    )
 
 
 class ConfiguredAirbyteStream(BaseModel):

airbyte-integrations/bases/standard-destination-test/src/main/java/io/airbyte/integrations/standardtest/destination/DataArgumentsProvider.java

@@ -0,0 +1,67 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 Airbyte
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+package io.airbyte.integrations.standardtest.destination;
+
+import java.util.stream.Stream;
+import org.junit.jupiter.api.extension.ExtensionContext;
+import org.junit.jupiter.params.provider.Arguments;
+import org.junit.jupiter.params.provider.ArgumentsProvider;
+
+/**
+ * Class encapsulating all arguments required for Standard Destination Tests.
+ *
+ * All files defined here can be found in src/main/resources of this package.
+ */
+public class DataArgumentsProvider implements ArgumentsProvider {
+
+  public static final CatalogMessageTestConfigPair EXCHANGE_RATE_CONFIG =
+      new CatalogMessageTestConfigPair("exchange_rate_catalog.json", "exchange_rate_messages.txt");
+  public static final CatalogMessageTestConfigPair EDGE_CASE_CONFIG =
+      new CatalogMessageTestConfigPair("edge_case_catalog.json", "edge_case_messages.txt");
+
+  @Override
+  public Stream<? extends Arguments> provideArguments(ExtensionContext context) {
+    return Stream.of(
+        Arguments.of(EXCHANGE_RATE_CONFIG.messageFile, EXCHANGE_RATE_CONFIG.catalogFile),
+        Arguments.of(EDGE_CASE_CONFIG.messageFile, EDGE_CASE_CONFIG.catalogFile)
+    // todo - need to use the new protocol to capture this.
+    // Arguments.of("stripe_messages.txt", "stripe_schema.json")
+    );
+
+  }
+
+  public static class CatalogMessageTestConfigPair {
+
+    final String catalogFile;
+    final String messageFile;
+
+    public CatalogMessageTestConfigPair(String catalogFile, String messageFile) {
+      this.catalogFile = catalogFile;
+      this.messageFile = messageFile;
+    }
+
+  }
+
+}