Enable region coverage on codecov

[taiki-e]

https://github.com/taiki-e/cargo-llvm-cov/releases/tag/v0.5.12

Catch cases where some regions are covered and others are not covered in the same line. For example, if the case that returns Ok is tested, but the case that returns Err is not, the line is marked as partially covered.

Blocked on taiki-e/cargo-llvm-cov#252.

[codecov]

Codecov Report

Merging #812 (47c5ae6) into main (64d7790) will decrease coverage by 2.58%.
The diff coverage is n/a.

❗ Current head 47c5ae6 differs from pull request most recent head 3eb1dae. Consider uploading reports for the commit 3eb1dae to get more accurate results

@@            Coverage Diff             @@
##             main     #812      +/-   ##
==========================================
- Coverage   65.49%   62.92%   -2.58%     
==========================================
  Files         111      111              
  Lines       14031    14031              
  Branches        0    14031   +14031     
==========================================
- Hits         9190     8829     -361     
+ Misses       4841     4790      -51     
- Partials        0      412     +412     

see 65 files with indirect coverage changes

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[OTL]

Thanks！