feat: major revamp to support label selection at scale + config file

[aimxhaisse]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 34.65909% with 115 lines in your changes missing coverage. Please review.

Project coverage is 89.66%. Comparing base (d652e84) to head (5956b36).

❗ Current head 5956b36 differs from pull request most recent head e53d277

Please upload reports for the commit e53d277 to get more accurate results.

Files	Patch %	Lines
eth_validator_watcher/watched_validators.py	0.00%	67 Missing ⚠️
eth_validator_watcher/entrypoint_v2.py	0.00%	39 Missing ⚠️
eth_validator_watcher/beacon.py	40.00%	9 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##              main      #93       +/-   ##
============================================
- Coverage   100.00%   89.66%   -10.34%     
============================================
  Files           17       20        +3     
  Lines          965     1113      +148     
============================================
+ Hits           965      998       +33     
- Misses           0      115      +115     

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