Validation in setters and parser structure.

[kkeroo]

This PR adds some validation logic to parser's setter methods like setAnchors(). It also fixes some docstrings/types and moves some code in Embeddings parser to follow the structure: 1. Constructor, 2. setters, 3. build, 4. run.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 6.52174% with 43 lines in your changes missing coverage. Please review.

Project coverage is 33.04%. Comparing base (37a2d92) to head (5d1b6b4).
Report is 10 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
depthai_nodes/ml/parsers/yolo.py	0.00%	31 Missing ⚠️
depthai_nodes/ml/parsers/embeddings.py	33.33%	6 Missing ⚠️
depthai_nodes/ml/parsers/keypoints.py	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #138      +/-   ##
==========================================
- Coverage   33.40%   33.04%   -0.36%     
==========================================
  Files          68       69       +1     
  Lines        3739     3740       +1     
==========================================
- Hits         1249     1236      -13     
- Misses       2490     2504      +14     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[jkbmrz]

LGTM