Add Twitch, error handling, revokation changes, etc

Refreshable connections, refactoring, access-token endpoint ...

- Aded /users/@me/connections/:connection_name/:connection_id/access-token
- Replaced `access_token` property on ConnectedAccount with `token_data` object for refreshing tokens
- Made a common interface for connection things like ComonOAuthTokenResponse
- Added `RefreshableConnection` class
- Added token refresh to Spotify connection (disabled)

Don't try to upload entire config for each connection loaded

WIP Discord connection

Fix ConnectionLoader from throwing when uploading default config keys

Follow Discord docs for `visibility` and `metadata_visibility` fields in ConnectedAccount

entities/ConnectionUpdateSchema -> schemas/ConnectionUpdateSchema

`handleCallback` returns connection if created for `USER_CONNECTIONS_UPDATE`

implement PATCH connection

adding connection now works

add connections

Remove test client and client patcher

Rename password_reset config to passwordReset as it messes with config key generation

fix a few issues with emails

move transporters to their own files

simplify replacer function

first batch of requested changes

implement password reset

add SendGrid transport

don't print anything if email send is successful

error if correspondence email is not set

fix for when secure is set to false

add right to resend verification emails

fix: email verification

config: require account verification

fix linting errors

Add mailjet transport

Add Mailgun transport

rename SMTPConfigurations to EmailConfiguration

Fix template rendering and use verify email template ...

email html is weird, some stuff isn't supported.