Use AbstractBatchingProcessor for InferenceProcessor

[chishui]

Description

Based on discussion, it's strongly recommended to move sub batching logic from _bulk API to each processor.

So for two batch supporting processors: text_embedding, sparse_encoding, based on discussion, we make them inherit from a newly introduced AbstractBatchingProcessing so that these two processors supports a new optional parameter batch_size and this parameter can control the cutting sub batches logic. The default of this parameter is 1 to be consistent with existing behavior.

Add more integration tests.

Issues Resolved

https://github.com/opensearch-project/OpenSearch/issues/14283

Check List

• [x] New functionality includes testing.
  • [x] All tests pass
• [x] New functionality has been documented.
  • [x] New functionality has javadoc added
• [x] Commits are signed as per the DCO using --signoff

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[zane-neo]

@chishui Please take a look on the conflict.

[chishui]

@chishui Please take a look on the conflict.

conflicts have been resolved