enhance elasticsearch body sanitization

[mznet]

Description

The existing sanitize_body can only handle limited types of queries, and sometimes it loses the query structure while sanitizing. It also cannot handle tricky queries like aggregation or script.
I improved the body sanitization by masking all values in the leaf nodes. It’s a simple solution, but more clear, no exception, and also keeps the query structure.

Fixes #3876

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

I added new queries like term, script, and aggregation to check if sanitize_body can sanitize well and not lose the query structure. I also checked that the existing test queries still keep their structure while masking.

Does This PR Require a Core Repo Change?

• Yes. - Link to PR:
• No.

Checklist:

See contributing.md for styleguide, changelog guidelines, and more.

• Followed the style guidelines of this project
• Changelogs have been updated
• Unit tests have been added
• Documentation has been updated

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: xrmx / name: Riccardo Magliocchetti (1beeab2)

[xrmx]

@mznet thanks, please add a changelog entry

[mznet]

@xrmx i've updated it.

[mznet]

@xrmx some tests were failed but i fixed them

[xrmx]

@mznet please run tox -e pyXX-test-instrumentation-elasticsearch-1 and tox -e lint-instrumentation-elasticsearch locally before the next push