Inline replies support and `old_x` on update and delete events

Breaking changes

• rest.create_crossposts has been renamed to rest.crosspost_message
• MessageCrosspost renamed to MessageRefence

Features

• New webhook endpoints to interact with messages sent by webhooks
  • rest.edit_webhook_message
  • rest.delete_webhook_message
• old_x fields on objects that are sent on XUpdateEvent and XDeleteEvent
  • This requires the cache to be enabled and the info to be available. If not, old_x will be None.
• Cache configuration is now possible by using BotApp(cache_settings=...)
• Message cache
  • Configurable by using hikari.config.CacheSettings
• Logging fixes
• New speedup (brotli)

Bugfixes

• bot.heartbeat_latency returning the sum of all shard latencies instead of the average
• bot.wait_for not removing waiter from the set on timeout
• Switch to using x-ratelimit-reset-after as reset_after for more precision
  • Add reactions endpoint should be faster now

Package version bumps

• aiohttp (3.7.2 -> 3.7.3)
• brotli (1.0.7 -> 1.0.9) [speedups] SECURITY BUG, PLEASE UPDATE IF YOU ARE USING IT