feat: Refine triggering abstraction

[robinholzi]

Motivation

Let's refine the abstraction for trigger a bit to enable more powerful triggering configuration.

Changes

Note: we will adjust the business logic in the future to use the new abstraction.

• New configuration models & refinement of existing models
• move trigger configs in dedicated files

[github-actions]

^{( % to main)
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[codecov]

Codecov Report

Attention: Patch coverage is 93.84615% with 4 lines in your changes missing coverage. Please review.

Project coverage is 82.83%. Comparing base (42354cf) to head (1a01977).
Report is 3 commits behind head on main.

Files	Patch %	Lines
modyn/config/schema/pipeline/trigger/ensemble.py	87.09%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #546      +/-   ##
==========================================
+ Coverage   82.81%   82.83%   +0.02%     
==========================================
  Files         217      220       +3     
  Lines       10152    10196      +44     
==========================================
+ Hits         8407     8446      +39     
- Misses       1745     1750       +5     

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[MaxiBoether]

generally LGTM, had a short question on the new field on the data drift trigger