[Feature Request]: Batch Stateful DoFns support in UnifiedWorker: Omit state commits implemented

[LEEKYE]

What would you like to happen?

Goal: Enhance support for Batch Stateful DoFns within the SDK harness to improve performance and efficiency.

Objective: This Key Result tracks the implementation of an optimization to "Omit state commits" for Batch Stateful DoFns where applicable.

Problem: Processing stateful DoFns in batch pipelines can incur overhead related to state management (e.g., reading, writing, committing state). For certain batch use cases, such as those that are key-shuffled or do not actually leverage state, these operations might be unnecessary and add to processing time and resource usage.

Solution: This KR involves propagating 'has_no_state' and 'only_bundle_for_keys' bits of ProcessBundleRequest from ProcessBundleHandler to where StateRequest(StateAppendRequest and StateGetRequest) is constructed. If 'has_no_state' is true, StateGetRequest can be skipped. If 'only_bundle_for_keys' is true, StateAppendRequest can be skipped

Issue Priority

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

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