mypy: don't ignore all imports, also disallow implicit optional

[skshetry]

No description provided.

[codecov]

Codecov Report

Base: 93.60% // Head: 93.61% // Increases project coverage by +0.01% 🎉

Coverage data is based on head (51406a5) compared to base (b0052aa).
Patch coverage: 93.33% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8814      +/-   ##
==========================================
+ Coverage   93.60%   93.61%   +0.01%     
==========================================
  Files         456      456              
  Lines       36130    36130              
  Branches     5234     5234              
==========================================
+ Hits        33819    33823       +4     
+ Misses       1814     1811       -3     
+ Partials      497      496       -1     

Impacted Files	Coverage Δ
dvc/compare.py	97.81% <ø> (ø)
dvc/dependency/repo.py	95.52% <ø> (ø)
dvc/fs/callbacks.py	41.17% <ø> (ø)
dvc/output.py	87.63% <ø> (ø)
dvc/render/converter/__init__.py	100.00% <ø> (ø)
dvc/repo/__init__.py	92.14% <ø> (ø)
dvc/repo/data.py	98.83% <ø> (ø)
dvc/repo/experiments/executor/base.py	83.57% <ø> (ø)
dvc/repo/experiments/init.py	98.51% <ø> (ø)
dvc/repo/experiments/utils.py	81.76% <ø> (ø)
... and 34 more

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