Refactor `/github` endpoint into it's own file

Properly filter existing embed links ...

In a previous PR, I was checking if the `.url` property existed, the
correct fix is to remove any embed that isn't a rich embed
type (non-link).

See also: #1296

Start fresh when updating embeds for links ...

In a previous commit I was attempting to be clever by only
replacing/removing embeds if necessary. This not only made the logic
more confusing but introduced a bug that would allow for orphaned
embeds when updating the search params of a URL.

This commit will remove all embeds that have a `.url` property and start
fresh. This simplifies the code and eliminates the aforementioned bug.

Fix various issues with embeds on message updates ...

The `postHandleMessage` function is parsing links and adding them to the
EmbedCache table if necessary. In the previous implementation, message
updates would push to the embeds unconditionally.

This commit parses links from the message and:

1. Normalizes the URLs
  - Useful for deduplicating similar URLs
2. Remove embeds with matching normalized URLs
  - Leaves all embeds except for ones with a `.url` property matching
  the updated message
  - This allows embeds to be re-ordered if the URL is moved
3. If no normalized URLs are found, remove all embeds
4. Take the deduplicated + normalized URLs and add an embed to the message and
insert into the EmbedCache table (if necessary)

This enables:

1. Embeds to be re-ordered by re-ordering links
2. Embeds to be removed by removing links

and fixes:

1. Duplicate embeds being attached to a message when edited

delete the null eater

acatually fix the embed issue ...

This one added the line in the right spot, sorry about the previous one lol

Update some patches, switch to node-fetch-commonjs, more updates

Perms for GET webhook, url property

Prettier & fix merge util/handlers/Message

Merge branch 'master' of https://github.com/DEVTomatoCake/spacebar-server into feat/webhooks-3

Fix ESLint & prettier

webhook fixes & username/avatar property for msg

Make channel ID optional when replying

fix: check for message components

fix: poll message is not an empty message

Make poll a single object instead of an array

fix poll in msg create schema

Don't embed links in <>

Ban API compat & Bulk Ban endpoint (#1120) ...

Co-authored-by: Madeline <46743919+MaddyUnderStars@users.noreply.github.com>

Embeds: handle og:sitename

Fix regression where generic embed handler wouldn't properly send image results

[fb] remove provider obj, add color

add facebook, and add steam fields

Rewrite thumbnail/image generation for embeds

Fix bug in embed handler where getMeta would not return undefined

xkcd embed handler and improved generic handler

Update ipAddress.ts

oapi: users progress

gifs and query params

fixing lots of openapi crap