[jnigen] Generate Kotlin stdlib classes without providing path

[HosseinYousefi]

Closes #2216.

• Adds Kotlin stdlib to APISummarizer's dependencies, so we can use its classloader to find Kotlin classes. This makes the user experience of generating Kotlin stdlib classes better.
• We only supported the exact fully qualified names, now we also support package names, so java.util will generate the entire package (same for Koltin stdlib).
• Also added versions to the dependencies of jnigen and jni (they were removed when we changed from maven to gradle).

cc @jwill

[github-actions]

PR Health

Breaking changes ⚠️

Package	Change	Current Version	New Version	Needed Version	Looking good?
jni	Breaking	0.14.1	0.14.1	0.15.0 Got "0.14.1" expected >= "0.15.0" (breaking changes)	⚠️

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Changelog Entry ✔️

Package	Changed Files

Changes to files need to be accounted for in their respective changelogs.

API leaks ⚠️

The following packages contain symbols visible in the public API, but not exported by the library. Export these symbols or remove them from your publicly visible API.

Package	Leaked API symbols
jni	_opaque_pthread_mutex_t _opaque_pthread_cond_t _Dart_FinalizableHandle _ReferenceType

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License Headers ✔️

// Copyright (c) 2025, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

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no missing headers

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pkgs/jni/lib/src/third_party/generated_bindings.dart
pkgs/objective_c/lib/src/ns_input_stream.dart

[coveralls]

coverage: 84.536% (+2.9%) from 81.603%
when pulling 586042a on kotlin-stdlib
into 11966f1 on main.