add blueprint and tutorial for pre and post process function of Bedrock Rerank API (#3254)

[tkykenmt]

Description

Amazon Bedrock introduced Rerank model support. OpenSearch can invoke Rerank models on Bedrock by writing custom pre/post processing function, but pre-built function is good for performance. This PR is for adding blueprint and tutorials to illustrate how to use these process functions.

Related Issues

Resolves #3254

Check List

• [ ] New functionality includes testing.
• [ ] New functionality has been documented.
• [ ] API changes companion pull request created.
• [x] Commits are signed per the DCO using --signoff.
• [x] Public documentation issue/PR created.

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