feat: Query parameter support for entity store query API

[albinsuresh]

Proposed changes

• Add query parameter support for the query API
• Supported parameters:
  • root
  • parent
  • type
  • depth
• Documentation

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvement (general improvements like code refactoring that doesn't explicitly fix a bug or add any new functionality)
• Documentation Update (if none of the other choices apply)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Paste Link to the issue

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA (in all commits with git commit -s)
• I ran cargo fmt as mentioned in CODING_GUIDELINES
• I used cargo clippy as mentioned in CODING_GUIDELINES
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

[codecov]

Codecov Report

Attention: Patch coverage is 93.26923% with 14 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...s/core/tedge_agent/src/http_server/entity_store.rs	87.01%	4 Missing and 6 partials ⚠️
...ates/core/tedge_agent/src/entity_manager/server.rs	0.00%	2 Missing ⚠️
crates/core/tedge_api/src/entity_store.rs	98.44%	2 Missing ⚠️

Additional details and impacted files

📢 Thoughts on this report? Let us know!

[github-actions]

Robot Results

✅ Passed	❌ Failed	⏭️ Skipped	Total	Pass %	⏱️ Duration
575	0	3	575	100	1h35m13.788419s

[didier-wenzek]

I don't see a depth parameter as useful, and I would not spent time implementing support for that.

In practice the entity tree will be mostly never deep.

[didier-wenzek]

I will be happy to approve, once docs added.