Adding new API to register backward compatible class names

[xiangfu0]

This pull request introduces a new method to the PluginManager class to support backward compatibility for plugin class names. This allows users to register mappings from deprecated class names to their new equivalents, helping maintain compatibility when plugins or libraries are updated.

Backward compatibility support:

• Added a registerBackwardCompatibleClassName method to PluginManager that lets users map old plugin class names to new ones for smoother deprecation and migration processes.

[Copilot]

Pull request overview

Adds an API on PluginManager to register mappings from deprecated plugin class names to their modern replacements, enabling backward compatibility during plugin/library migrations.

Changes:

• Introduced registerBackwardCompatibleClassName(oldClassName, newClassName) to store deprecated→new class name mappings.
• Added an inline comment describing the method’s intent.

[codecov-commenter]

❌ 2 Tests Failed:

Tests completed	Failed	Passed	Skipped
10884	2	10882	52

View the top 3 failed test(s) by shortest run time

org.apache.pinot.controller.helix.core.minion.PinotTaskManagerDistributedLockingTest::testForceReleaseLockDuringTaskExecution

Stack Traces | 18.8s run time

Both createTask calls should have generated tasks expected [2] but found [3]

org.apache.pinot.controller.helix.core.minion.PinotTaskManagerDistributedLockingTest::testForceReleaseLockDuringTaskExecution

Stack Traces | 21.1s run time

Both createTask calls should have generated tasks expected [2] but found [3]

org.apache.pinot.integration.tests.TableRebalancePauselessIntegrationTest::setUp

Stack Traces | 126s run time

Failed to start Kafka cluster after 3 attempts

org.apache.pinot.integration.tests.TableRebalancePauselessIntegrationTest::testForceCommit

Stack Traces | 126s run time

java.lang.AssertionError: expected object to not be null

To view more test analytics, go to the Test Analytics Dashboard
_{📋 Got 3 mins? Take this short survey to help us improve Test Analytics.}

[9aman]

LGTM