feat: support function-format parameters in Insight Data API

[silenceqi]

What does this PR do

This update introduces support for specifying query parameters using the following function format:
{ "function": { "rate": { "field": "payload.elasticsearch.shard_stats.search.query_total", "scale": 1 } } }
This enhancement improves flexibility in defining aggregation functions within queries.

Rationale for this change

Standards checklist

• The PR title is descriptive
• The commit messages are semantic
• Necessary tests are added
• Updated the release notes
• Necessary documents have been added if this is a new feature
• Performance tests checked, no obvious performance degradation

[medcl]

update docs for zh as well.

[luohoufu]

LGTM