[BUG] Remove InferenceProcessor from Java Client

[dylan-tong-aws]

Describe the bug

Remove this. It's Elastic X-Pack code.

https://github.com/opensearch-project/opensearch-java/blame/main/java-client/src/m[…]org/opensearch/client/opensearch/ingest/InferenceProcessor.java

Related component

Clients

To Reproduce

n/a

Expected behavior

n/a

Additional Details

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• Version [e.g. 22]

Additional context
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[dblock]

Note that the InferenceProcessor relates to this:
https://www.elastic.co/guide/en/elasticsearch/reference/current/ingest-pipeline-search-inference.html
https://www.elastic.co/guide/en/elasticsearch/reference/current/inference-processor.html