[Feature] Support flink 2.x version

[JNSimba]

Proposed changes

Because some APIs are incompatible between Flink 2.x and Flink 1.x, the project was refactored, resulting in the creation of the modules flink1 and flink2.

Flink1 supports Flink 1.15-1.20 and is compiled using JDK 1.8.

Flink2 supports Flink 2.0 and above and is compiled using JDK 17.

Checklist(Required)

1. Does it affect the original behavior: (Yes/No/I Don't know)
2. Has unit tests been added: (Yes/No/No Need)
3. Has document been added or modified: (Yes/No/No Need)
4. Does it need to update dependencies: (Yes/No)
5. Are there any changes that cannot be rolled back: (Yes/No)

Further comments

If this is a relatively large or complex change, kick off the discussion at dev@doris.apache.org by explaining why you chose the solution you did and what alternatives you considered, etc...

[Copilot]

Pull request overview

Refactors the Flink Doris Connector to support Flink 2.x by splitting version-specific integration into separate modules while keeping shared logic in a common base.

Changes:

• Introduces Flink 1.x adapter wrappers around shared writer implementations (stream load / batch / copy).
• Refactors core writers in base to be Flink-version-neutral (no direct Sink.InitContext dependency).
• Updates build tooling, README, and CI workflows to build/test Flink 1.x (JDK 8) vs Flink 2.x (JDK 17).

Reviewed changes

Copilot reviewed 30 out of 394 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
flink-doris-connector/flink-doris-connector-flink1/src/main/java/org/apache/doris/flink/sink/writer/DorisWriterAdapter.java	Adds Flink 1.x wrapper delegating to version-neutral core DorisWriter.
flink-doris-connector/flink-doris-connector-flink1/src/main/java/org/apache/doris/flink/sink/copy/DorisCopyWriterAdapter.java	Adds Flink 1.x wrapper delegating to version-neutral core DorisCopyWriter.
flink-doris-connector/flink-doris-connector-flink1/src/main/java/org/apache/doris/flink/sink/batch/DorisBatchWriterAdapter.java	Adds Flink 1.x wrapper delegating to version-neutral core DorisBatchWriter.
flink-doris-connector/flink-doris-connector-flink1/src/main/java/org/apache/doris/flink/sink/batch/DorisBatchSink.java	Switches batch sink to use the new adapter.
flink-doris-connector/flink-doris-connector-flink1/src/main/java/org/apache/doris/flink/sink/DorisSink.java	Switches sink writer creation to use new adapters per write mode.
flink-doris-connector/flink-doris-connector-flink1/src/main/java/org/apache/doris/flink/catalog/DorisCatalog.java	Formatting-only change to exception list.
flink-doris-connector/flink-doris-connector-flink1/pom.xml	Introduces Flink 1.x module POM (Flink 1.20 / JDK 8).
flink-doris-connector/flink-doris-connector-base/src/test/java/org/apache/doris/flink/sink/writer/TestRowDataSerializer.java	Clears thread interrupt status in test setup.
flink-doris-connector/flink-doris-connector-base/src/test/java/org/apache/doris/flink/sink/writer/TestDorisWriter.java	Updates tests for refactored writer constructor and exception type.
flink-doris-connector/flink-doris-connector-base/src/test/java/org/apache/doris/flink/sink/writer/TestDorisStreamLoad.java	Clears thread interrupt status in test setup.
flink-doris-connector/flink-doris-connector-base/src/test/java/org/apache/doris/flink/sink/copy/TestDorisCopyWriter.java	Updates tests for refactored copy writer constructor.
flink-doris-connector/flink-doris-connector-base/src/test/java/org/apache/doris/flink/sink/batch/TestDorisBatchWriter.java	Updates tests for refactored batch writer constructor.
flink-doris-connector/flink-doris-connector-base/src/test/java/org/apache/doris/flink/container/AbstractContainerTestBase.java	Ensures containers are closed via @AfterClass.
flink-doris-connector/flink-doris-connector-base/src/main/java/org/apache/doris/flink/table/DorisRowDataJdbcLookupFunction.java	Adds eval(RowData) overload and delegates varargs eval to it.
flink-doris-connector/flink-doris-connector-base/src/main/java/org/apache/doris/flink/sink/writer/DorisWriter.java	Makes core writer version-neutral by removing direct InitContext dependency.
flink-doris-connector/flink-doris-connector-base/src/main/java/org/apache/doris/flink/sink/copy/DorisCopyWriter.java	Makes core copy writer version-neutral by removing direct InitContext dependency.
flink-doris-connector/flink-doris-connector-base/src/main/java/org/apache/doris/flink/sink/copy/BatchRecordBuffer.java	Javadoc formatting improvements.
flink-doris-connector/flink-doris-connector-base/src/main/java/org/apache/doris/flink/sink/batch/DorisBatchWriter.java	Makes core batch writer version-neutral by removing direct InitContext dependency.
flink-doris-connector/flink-doris-connector-base/src/main/java/org/apache/doris/flink/sink/batch/BatchRecordBuffer.java	Javadoc formatting improvements.
flink-doris-connector/flink-doris-connector-base/src/main/java/org/apache/doris/flink/cfg/DorisReadOptions.java	Minor formatting update.
flink-doris-connector/flink-doris-connector-base/src/main/java/org/apache/doris/flink/cfg/DorisConnectionOptions.java	Minor formatting update.
flink-doris-connector/flink-doris-connector-base/src/main/java/org/apache/doris/flink/catalog/DorisTypeMapper.java	Minor formatting update.
flink-doris-connector/flink-doris-connector-base/pom.xml	Introduces base module POM for shared code built per profile.
flink-doris-connector/build.sh	Adds Flink 2.x options, enforces JDK version, builds module/profile-specific artifacts.
README.md	Documents supported Flink versions and JDK requirements.
.github/workflows/run-itcase-flink2.yml	Adds ITCase workflow for Flink 2.x on JDK 17.
.github/workflows/run-itcase-flink1.yml	Renames/adjusts ITCase workflow to be Flink 1.x specific.
.github/workflows/run-e2ecase-flink2.yml	Adds E2E workflow for Flink 2.x on JDK 17.
.github/workflows/run-e2ecase-flink1.yml	Renames/adjusts E2E workflow to be Flink 1.x specific.
.github/workflows/build-connector.yml	Builds both Flink 1.x (JDK 8) and Flink 2.x (JDK 17) connector variants.

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