feat: add resource control for webhook form action

[TrySound]

Ref #4093 #3871

Here added new resource control for out properties. It is replaced action and method properties webhook form. Now users will be able to additionally provide headers. In another PR headers will let user to customize body format.

Also migrated "action" in existing webhook forms to resource prop type.

[kof]

• Icon position is off:

[kof]

Haven't tested, but looks great, lets list what this enables from use cases perspective, so that once @johnsicili is back we can record an edu video, maybe replacing the old form video.

Are all of these done? #4093

[kof]

So far I see 2 use cases we need to demonstrate:

1. As a user sometimes I need to use an API that only accepts json data and requires tokens in headers. One such example is signing up for newsletter in splunk https://docs.useplunk.com/api-reference/contacts/subscribe

2. Using response json and rendering something in return as a success or error.

Am I correct to assume both use cases are supported now?

[TrySound]

In this PR only headers are supported

[kof]

Got it, so this unlocks a use case like useplunk.

[TrySound]

Yes, though I'm planning a small launch with all those features requested so webhook forms would make more sense to users.

[kof]

Btw you should try to post something to https://docs.useplunk.com/api-reference/contacts/subscribe to see if we are still missing something there