[Feature Request]: Add numbering to ordered video grids

[jasonhenriquez]

Guidelines

• I have searched the issue tracker for open and closed issues that are similar to the feature request I want to file, without success.
• I have searched the documentation for information that matches the description of the feature request I want to file, without success.
• This issue contains only one feature request.

Problem Description

Grid views containing videos in a particular order are currently un-numbered, compared to ft-list-video-numbered, for list views of ordered videos. This information might be pertinent in certain contexts.

Proposed Solution

Implement displayed ordinals for videos in a grid view. This currently only needs to be implemented for the User Playlist grid view, since that is the only other place where we use a grid equivalent of ft-list-video-numbered. The ordinals need to be legible even with watched styling.

Alternatives Considered

Don't implement this feature.

Issue Labels

display more information to user

Additional Information

See #4949 for additional context.