Add support for displaying "mapper" badge in comment section

[frenzibyte]

• Closes Mapper pill is missing in-game #26959

For a quick summary on the interaction between the client and the API on determining the "mapper" badge, there exists a property in each comment bundle named commentable_meta. The property contains information about the page which the user is commenting on ("commentable object"). The field owner_id defines the user which owns the page (e.g. the mapper in a beatmap page), and the field owner_title which has the title given to the user (e.g. "mapper").

Interestingly, the commentable_meta property is actually a list of potentially multiple CommentableMeta elements, instead of a singular one. I've inquired about this in discord and it seems there is somewhat of a technical reason behind it? Either way, I've went with a sane approach of finding the most relevant CommentableMeta by comparing against the commentable ID associated with the comment (which sort of matches web?).

The part I'm most unsure of is the structure of passing the CommentableMeta data. I've went with the simplest approach of passing it via constructor from CommentableContainer down to each Comment, adding an extra parameter in each GetDrawableComment call. Open to feedback on any other method to better approach this.

[bdach]

Have applied changes. Mostly minor, up until 68247fa - typo in json property name meant that this would have never actually worked outside of tests because

osu/osu.Game/Overlays/Comments/CommentAuthorLine.cs

Line 53 in 3f46e1a

var ownerMeta = meta.FirstOrDefault(m => m.Id == comment.CommentableId && m.Type == comment.CommentableType);

would fail to match due to null commentable_type on one side of the comparison (which shows that there was clearly no attempt to test in the real world).

[frenzibyte]

Oh haha, this is the name I chose initially for the variable. It read slightly weird to me so I replaced Without with No.

[frenzibyte]

(which shows that there was clearly no attempt to test in the real world).

Kindly stop, I literally tested this on production. It was only the fact that I had altered the conditions of querying the metadata on the last minutes of opening a PR as I was checking against web (read second paragraph of #27164 (comment)). Saying "clearly no attempt" is straight up an insult to me, I'm sure you know that.