add gh actions PR summarizer

[mikejhuang]

No description provided.

[github-actions]

GPT summary of None - 9e155e:

• Creates an action to write a comment about every commit in a pull request
• Generates a summary for every file that was modified and adds it to the review page
• Compiles a PR summary from all commit summaries and file diff summaries
• Deletes outdated code review comments

[github-actions]

GPT summary of 870d3aa:

• Added a Github action to summarize commits and generate a PR summary gpt-commit-summarizer.yml

PR summary so far:

• Added a Github action to generate a PR summary
• Action compiles a summary from all commits and files
• Deletes outdated code review comments

[codecov-commenter]

Codecov Report

Merging #97 (870d3aa) into master (28851cb) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #97   +/-   ##
=======================================
  Coverage   59.07%   59.07%           
=======================================
  Files          12       12           
  Lines        1845     1845           
=======================================
  Hits         1090     1090           
  Misses        755      755           

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