feat: meta-gradient module

[XuehaiPan]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 39.42731% with 275 lines in your changes missing coverage. Please review.

Project coverage is 58.11%. Comparing base (9def086) to head (2dc79c6).
Report is 146 commits behind head on main.

Files with missing lines	Patch %	Lines
torchopt/nn/module.py	13.43%	187 Missing ⚠️
torchopt/diff/implicit/nn/module.py	22.11%	74 Missing ⚠️
torchopt/diff/implicit/decorator.py	92.00%	6 Missing ⚠️
torchopt/distributed/autograd.py	75.00%	2 Missing ⚠️
torchopt/pytree.py	66.67%	2 Missing ⚠️
torchopt/utils.py	60.00%	2 Missing ⚠️
torchopt/linear_solve/normal_cg.py	66.67%	1 Missing ⚠️
torchopt/optim/meta/base.py	85.71%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #101      +/-   ##
==========================================
- Coverage   63.32%   58.11%   -5.21%     
==========================================
  Files          58       62       +4     
  Lines        2301     2638     +337     
==========================================
+ Hits         1457     1533      +76     
- Misses        844     1105     +261     

Flag	Coverage Δ
unittests	58.11% <39.43%> (-5.21%)	⬇️

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