Update component configuration type warnings

[mdekstrand]

This updates the component configuration check logic to use get_type_hints for simplicity + Python-provided correctness, makes Component properly an abstract base class, and improves the configuration type warning logic.

[codecov]

Codecov Report

Attention: Patch coverage is 92.85714% with 2 lines in your changes missing coverage. Please review.

Project coverage is 89.98%. Comparing base (f5a0422) to head (90eba72).
Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
lenskit/lenskit/pipeline/components.py	92.85%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #603      +/-   ##
==========================================
- Coverage   89.98%   89.98%   -0.01%     
==========================================
  Files         107      107              
  Lines        6608     6617       +9     
==========================================
+ Hits         5946     5954       +8     
- Misses        662      663       +1     

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