feat: comment actions (issue/PR)

[shreyas1599]

• Edit and Delete actions in comments of Issues and Pull Requests
• Update ActionButton to use icons
• CommentItem has a prop commentActionItemList. (TODO: for services except gitee)
• minor fix: removed a print statement from GeCommit
• added PATCH and DELETE HTTP request types. Refactored fetchGiteeand added prop requestType
• _ge_issue_comment looks a bit cluttered with the if statements. I'm not sure how to refactor and make it look cleaner. Any help is appreciated. Thanks._
• added textControllerto ge_issue_comment. Easier to deal with updation of a comment

(Just saw that Github markdown supports video as well. Wanted to see how it looks. Hence the video below (also easier instead of copy-pasting multiple screenshots))

https://user-images.githubusercontent.com/28999492/104002023-7ef08b00-51c6-11eb-9378-b02e990b3b54.mp4