[FLINK-32885 ] [flink-clients] Refactoring: Moving UrlPrefixDecorator into flink-clients so it can be used by RestClusterClient for PyFlink remote execution

[elkhand]

FLINK-32885 Refactoring: Moving UrlPrefixDecorator into flink-clients so it can be used by RestClusterClient for PyFlink remote execution

What is the purpose of the change

UrlPrefixDecorator is introduced in flink-sql-gateway module, which has a dependency on flink-clients module. RestClusterClient will also need to use UrlPrefixDecorator for supporting PyFlink remote execution. Will refactor related classes to achieve this.

This PR will be used in FLINK-32884 PyFlink remote execution should support URLs with paths and https scheme

Brief change log

• Moved UrlPrefixDecorator class from flink-sql-gateway module into flink-clients module

Verifying this change

This change is already covered by existing tests, such as :

• https://github.com/apache/flink/blob/master/flink-table/flink-sql-client/src/test/java/org/apache/flink/table/client/SqlClientTest.java
• https://github.com/apache/flink/blob/master/flink-end-to-end-tests/flink-end-to-end-tests-restclient/src/test/java/org/apache/flink/runtime/rest/RestClientITCase.java
• https://github.com/apache/flink/blob/master/flink-table/flink-sql-client/src/test/java/org/apache/flink/table/client/gateway/ExecutorImplITCase.java

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): no
• The public API, i.e., is any changed class annotated with @Public(Evolving): yes
• The serializers: no
• The runtime per-record code paths (performance sensitive): no
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: no
• The S3 file system connector: no

Documentation

• Does this pull request introduce a new feature? no

[flinkbot]

CI report:

• 161ef18 Azure: SUCCESS

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[tweise]

@afedulov PTAL

[afedulov]

Looks good!