Reader Comments: Reuse the new comment content cell

[dvdchr]

Refs #17475, pbArwn-2ks-p2#comment-4358, and pbArwn-38X-p2

Reuse the content cell from CommentDetailViewController, reuse logic where possible, and customize as needed. Here's a list of expected changes to the content cell:

Description	Design
Author badge
Highlighted comment1
Top-level only separators
Pending comments
Reply button active state

Tasks

• Reader Comments: Display the new content cell #17532
• Reader Comments: Update reaction bar logic #17535
• Reader Comments: Show ellipsis button when comment can be moderated #17557
• Reader Comments: Show separator for last leaf comments #17549
• Reader Comments: Indent cells according to comment depth #17551
• Parse comment author's ID from API:
  • Comments: Parse author dotcom ID WordPressKit-iOS#469
  • Comments: Add author ID field. #17566
• Show author badge:
  • Update WordPressKit to populate authorID in RemoteReaderPost. Addressed in Comments: Parse author dotcom ID WordPressKit-iOS#469.
  • Parse authorID in ReaderPost. Addressed in Comments: Add author ID field. #17566
  • Reader Comments: Show the author badge for comments from author #17589
• Implement logic for when the Reply and Like buttons are tapped. Addressed in Reader Comments: Handle content cell action buttons #17600.
• Handle when links in the comment body are tapped. Addressed in Reader Comments: Handle content cell action buttons #17600.
• Update the Reply button state when the reply text view is "targeting" the comment. Addressed in Reader Comments: Highlight the cell when it's focused or navigated to #17656.
• Implement the cell highlight animation when navigating to a specific comment. Addressed in Reader Comments: Highlight the cell when it's focused or navigated to #17656.

Display comments using the previous mechanism

• Reader Comments: Refactor content cell to have configurable render method #17634
• Reader Comments: Implement comment rendering via WPRichContent #17635

Issues

• The header cell sometimes goes missing after scrolling a lot of rows.

Postponed

• Show pending comments from self. See: pbArwn-2ks-p2#comment-4417
• Optimize table view performance. We'll revert to the previous rendering mechanism for now.

Footnotes

1. pbArwn-2ks-p2#comment-3375 – when navigating to a specific comment in the thread, the comment should be highlighted for a second. ↩