Enhance comments

[goblinodds]

1. Add a field “type” (or maybe there’s a better name that doesn’t collide with reserved terms so much?) to the comment model
2. Define four types: Comment, Q&A, reasoning, and endorsement
3. Split the comment section into four tabs (one tab is already there): Comments, Questions & Answers, Reasoning, and Endorsement
4. A comment posted in tab Reasoning should automatically get the type reasoning set, and so on

I haven’t thought much about the names of the fields and values, so feel free to pick something better. :-)

[goblinodds]

@Telofy

Just realized I included my questions in the commit but probably should've put them here instead:

• Do we want different placeholder text for each tab? I changed the universal one to “Type your comment here." for now.

• I handled replies by including "REPLY" as a category; does this work or would it be better for replies to have categories that match the category of what they're replies to?

• The "bounty" page only has a Q&A tab but typescript of course wanted a "category," so I used the same code as in the project page but without the filter. (Included a comment so it's easy to remember this in case we want to add more tabs.)

• I'm not confident how this handles existing comments; the model sets comments to the "COMMENT" category by default, but is it possible previous comments will get filtered out bc their category will still be undefined?

• Re: line 48 of addCommentForm.tsx. I tried logging to the console in one of the onSuccess functions but nothing ever seems to get logged. Is that function working?

[Telofy]

1. “Type your comment here” seems good to me.
2. Oh, hmm. I’d guess that it doesn’t matter. We’ll see.
3. Great!
4. If a new column is created with a default value of comment, then all the old comments should automatically receive that default value. If my assumptions are somehow wrong, and that doesn’t happen, then we’ll need a data migration to set the category correctly.
5. Huh! I’ll have a look when I review the code. Thanks for checking!