internal: hoist resolver/top-level metrics/plots/params data to file level

[skshetry]

where it makes sense, since it is a part of file rather than "StageLoader".

[codecov]

Codecov Report

Base: 93.52% // Head: 93.52% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (e1ffaaa) compared to base (f386f7c).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8754   +/-   ##
=======================================
  Coverage   93.52%   93.52%           
=======================================
  Files         457      457           
  Lines       36229    36249   +20     
  Branches     5252     5257    +5     
=======================================
+ Hits        33882    33902   +20     
  Misses       1840     1840           
  Partials      507      507           

Impacted Files	Coverage Δ
dvc/dvcfile.py	96.78% <100.00%> (+0.32%)	⬆️
dvc/repo/stage.py	90.84% <100.00%> (ø)
dvc/stage/__init__.py	93.97% <100.00%> (+0.01%)	⬆️
dvc/stage/loader.py	99.18% <100.00%> (-0.06%)	⬇️
tests/func/test_stage.py	100.00% <100.00%> (ø)
tests/unit/stage/test_loader_pipeline_file.py	100.00% <100.00%> (ø)

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