Webhook Auth: Add authentication rules to webhooks

[amberrignell]

Figma: https://www.figma.com/file/2Uvr2jOaQh6rQNR1cHlLKM/App?type=design&node-id=262-4097&mode=design

Overview:

As a user, I want to be able to add either Basic or API Key based authentication to my Webhooks to have a layer of security.

• When creating or editing a Webhook trigger, I should be able to add a "Authentication" Credential.
• Within OpenFn, we should allow the user to select to setup Basic HTTP Authentication or API Key Authentication
• The user can opt to have no form of authentication

As a user, I may need to rotate keys, therefore:

• I may want to have multiple authentications that can exist for a single Webhook
• These multiple authentications can be of different types (Basic or API key)

Issues created for the implementation all linked to this Epic

[NickOpenFn]

Not ready: Requires UI

[taylordowns2000]

@elias-ba , @midigofrank , @NickOpenFn - noting this here so I don't forget.... the create/update/delete actions on webhook_auth_methods themselves and the add/remove actions (create/delete on trigger_webhook_auth_methods- the many-to-many table) need audit trail actions that are very similar to those defined for credentials. Nick and I will sync up on this tomorrow to get you the full list!