fix(fluxerbridge): valid api hostnames for Discord

feat(fluxerbridge): allow emojis to be relayed

fix(fluxerbridge): queue handler task spawning before config init

fix(fluxerbridge): normalize Discord's base URL

fix(fluxerbridge): add timeout to bot.wait_for()

enhance(fluxerbridge): handle Fluxer maintenance in retry logic

refactor(fluxerbridge): split out mention replacer closure

enhance(fluxerbridge): substitute mentions with rendered representation

fix(fluxerbridge): the retry conditions

enhance(fluxerbridge): add user/bot indicator in the username

fix(fluxerbridge): typing issue

fix(fluxerbridge): stickers not showing when content is embedded

enhance(fluxerbridge): move the edit delay message to the end of embed

fix(fluxerbridge): message parsing error due to Fluxer differences

refactor(fluxerbridge): split out message generation from events