add config field in MLToolSpec for static parameters

[jngz-es]

Description

Add config field in MLToolSpec to support static parameters in tool execution.

Related Issues

https://github.com/opensearch-project/ml-commons/issues/2836 https://github.com/opensearch-project/ml-commons/issues/2918

Check List

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

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[jngz-es]

The flow framework issue, https://github.com/opensearch-project/flow-framework/issues/878.

[yuye-aws]

@reuschling Can you help review this PR?

[yuye-aws]

@jngz-es Can you please provide an example on how to use tool config?

[jngz-es]

@jngz-es Can you please provide an example on how to use tool config?

Provided an example in the description section.

[yuye-aws]

Pinging @reuschling to review the PR.

[dbwiddis]

Pinging @reuschling to review the PR.

Thanks @yuye-aws for prompting review on this. Thanks @Zhangxunmt for approval. Thanks @dhrubo-os for your initial review.

Code freeze / 2.18 RC generation is next Tuesday Oct 22. Downstream plugin PRs (https://github.com/opensearch-project/flow-framework/pull/899) are dependent on this one being merged and need time to update and consume tne new snapshots, get proper reviews, and merge before code freeze.

Please do not wait until the last minute to get this merged; last-minute PR merges have occurred in at least 2 previous releases and this one's been open for a few weeks. I'm sensing a pattern here.

CC: @minalsha @ylwu-amzn