Add lint check workflow & format all source files

[Officeyutong]

Only need to review changes under .github folder. Changes on other files are introduced by formatting them.

[yunwei37]

use https://github.com/DoozyX/clang-format-lint-action

[codecov]

Codecov Report

Merging #76 (e265bad) into main (af40de8) will decrease coverage by 4.62%.
The diff coverage is n/a.

❗ Current head e265bad differs from pull request most recent head 840c98f. Consider uploading reports for the commit 840c98f to get more accurate results

@@            Coverage Diff             @@
##             main      #76      +/-   ##
==========================================
- Coverage   77.88%   73.27%   -4.62%     
==========================================
  Files          10       10              
  Lines         954      954              
==========================================
- Hits          743      699      -44     
- Misses        211      255      +44     

see 3 files with indirect coverage changes

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