[Feature][GitHub] Get all normal comments, review, review comments and store them in table.pull_request_comments

[Startrekzky]

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• I had searched in the issues and found no similar feature requirement.

Description

Get all GitHub PR's normal comments, review, review comments, and store them in the table.pull_request_comments.
I need all comments' id, body, and type.

For values of the type field in the table.pull_request_comments:

1. for normal comments: NORMAL
2. for review comments, ie. diff/inline comments: DIFF. Both are fine to me, just make sure it's consistent with GitLab
3. for reviews' body (exist in GitHub but not GitLab, see pic below): REVIEW

Use case

In order to calculate metrics like 'PR pickup time' and 'PR review time', I have to gather all types of PR comments' submitted/created time.

Related issues

#1746
#2268

Are you willing to submit a PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct