Add char_limit to initial-state of mastofe
See https://git.pleroma.social/tyge/mastodon/commit/db136f95105ea1e0a7a2a295d4aa67ee112d39c8 . I'm currently working on polishing the mastofe - among these, I'd like to add the char_limit to the initial-state, this way we wouldn't have to add an API call from the mastofe to get the limit.