[Feature Request]: Implement equals, hashCode in FlinkRunner's OrderedListState.

[twosom]

What would you like to happen?

FlinkRunner's OrderedListState (i.e. FlinkOrderedListState) does not have an implementation of equals, hashCode, unlike other States in FlinkRunner.
Before starting to write tests for the OrderedListState(#31723), we should implement those methods.

Issue Priority

Priority: 2 (default / most feature requests should be filed as P2)

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[twosom]

.take-issue