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[SPARK-16625][SQL] General data types to be mapped to Oracle
## What changes were proposed in this pull request? Spark will convert **BooleanType** to **BIT(1)**, **LongType** to **BIGINT**, **ByteType** to **BYTE** when saving DataFrame to Oracle, but Oracle does not support BIT, BIGINT and BYTE types. This PR is convert following _Spark Types_ to _Oracle types_ refer to [Oracle Developer's Guide](https://docs.oracle.com/cd/E19501-01/819-3659/gcmaz/) Spark Type | Oracle ----|---- BooleanType | NUMBER(1) IntegerType | NUMBER(10) LongType | NUMBER(19) FloatType | NUMBER(19, 4) DoubleType | NUMBER(19, 4) ByteType | NUMBER(3) ShortType | NUMBER(5) ## How was this patch tested? Add new tests in [JDBCSuite.scala](wangyum@22b0c2a#diff-dc4b58851b084b274df6fe6b189db84d) and [OracleDialect.scala](wangyum@22b0c2a#diff-5e0cadf526662f9281aa26315b3750ad) Author: Yuming Wang <[email protected]> Closes apache#14377 from wangyum/SPARK-16625.
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