Comments: Create the new content cell

[dvdchr]

Refs #17087

Since the comment content cell is quite large, I'll break down the implementation further so the PR chunks are slightly more manageable. As such, this issue is created to track all the work items for the comment content cell.

Here are some designs from Zeplin:

Description	Screenshot
Short content
Long content with image
Content with image and blockquote

Some notes:

• Content will be displayed using a WKWebView.
• Some functionalities of the cell may be disabled, depending on site type and account permissions.

Todo

• Comment Detail: Content cell initial view #17109
• Comment Detail: Render content in web view #17129
• Handle button taps:
  • Comment Detail: Add functionality to the share button #17269
  • Comment Detail: Add functionality for the Like button #17273
• Comment Detail: Handle content link clicks #17253
• Comment Detail: Toggle components visibility based on permission #17147
• Comment Detail: Adjust comment content for RTL layout #17254