feat(unstable): support comments in lint plugin

[marvinhagemeister]

This PR adds support for comments in the AST for lint plugins.

• The Program node has a comments field pointing to an array of all comments.
• SourceCode.getAllComments(): Returns all comments (same as program.comments)
• SourceCode.getCommentsBefore(node): Get all comments before this Node
• SourceCode.getCommentsAfter(node): Get all comments after this Node
• SourceCode.getCommentsInside(node): Get all comments inside this Node

ESLint docs:

• https://eslint.org/docs/latest/extend/custom-rules#accessing-the-source-code
• https://eslint.org/docs/latest/extend/custom-rules#accessing-comments

[iuioiua]

Closes #29100

[bartlomieju]

LGTM, pretty cool, please remove the TODO