dx: Reduce number of files needed for OAuth and/or Webhook-triggered blocks

[Pwuts]

The number of files you need to add/edit for new blocks with auth, and webhook-triggered blocks, is quite large. For DX we should try to reduce/simplify this.

File you have to add/edit for a new block:

• backend/blocks/my_block.py

Files where references have to be added for a new provider (in the credentials system):

• backend/integrations/providers.py - ProviderName enum
• frontend/src/components/integrations/credentials-input.tsx - providerIcons
• frontend/src/components/integrations/credentials-provider.tsx - providerDisplayNames
• frontend/src/lib/autogpt-server-api/types.ts - PROVDER_NAMES

Extra files for a new OAuth provider:

• backend/integrations/oauth/{provider}.py
• references in:
  • backend/integrations/oauth/__init__.py
  • backend/util/settings.py + .env.example - OAuth server credentials

Extra files for a new WebhooksManager:

• backend/integrations/webhooks/{provider}.py
• reference in backend/integrations/webhooks/__init__.py

I'm sure we can put the front end stuff together in one file. Not so sure about the back end. As long as it's clearly documented, I don't see an issue with having to add (references in) multiple files, but if we can reasonably avoid it that's still good.

Originally posted by @Pwuts in #8358 (comment)

[Pwuts]

I wonder if we can do reflection to handle some of this via enumerators like we do enumerating the blocks in the directory

~ @ntindle

[Pwuts]

I wonder if we can do reflection to handle some of this via enumerators like we do enumerating the blocks in the directory

~ @ntindle