Add ability to recalculate user statistics

[BrokenEagle]

Related to #3756. By now, there are probably plenty of user's whose upload counts are off. Actually, this was probably an issue even before asynchronous uploads, as my own uploads are off, and I haven't had any of those failed uploads stuck in the preprocessed state.

• Profile: 14206
  https://danbooru.donmai.us/users/23799
• Post count: 14233
  https://danbooru.donmai.us/counts/posts?tags=user%3ABrokenEagle98+status%3Aany

However, it's not just uploads, as other statistics are off as well.

Note versions:

• Profile: 32307
• Version count: 30270
  https://danbooru.donmai.us/note_versions?limit=100&page=303&search%5Bupdater_id%5D=23799

Post versions:

• Profile: 435178
• Version count: 41822
  https://danbooru.donmai.us/post_versions?limit=100&page=4183&search%5Bupdater_id%5D=23799

Most of the other ones were spot on, but some of them were still off by one.

I see a couple possible solutions to this:

1. Run a daily, weekly, or monthly task that recalculates all statistics for all users

This would be quite laborious as there are over half a million users.

2. Run a recheck everytime a profile page is visited

Not as laborious as 1, although it would still be a bit wasteful unless it was restricted to running once per day, or something like that.

3. Have an on demand recheck option for certain levels of users

Kind of like how the tag fix option works. It could be restricted to just Builder+ to prevent abuse.

[r888888888]

I just noticed there's a counter_cache on the uploader relation on Post. Is it possible it was double counting all this time? Anyway I don't think a manual increment is necessary.

[evazion]

@r888888888 2866335 broke the site map. There's a typo in the route, should be new_maintenance_user_count_fixes_path.

[BrokenEagle]

As noted by myself and several others, the refresh function doesn't seem to change any of the numbers for uploads, note changes, or post changes.

[r888888888]

This is fixed now.