feat(webhooks): pass webhook-* annotations to webhook providers

[Raffo]

Description

Fixes #4367

This PR allows to forward specific implementations to webhook implementations so that they can make use of them.

@hans-m-song is this what you expected?

Checklist

• Unit tests updated
• End user documentation updated

[mloiseleur]

Wdyt about adding a few words about this in the documentation ?
Otherwise, lgtm.

[mloiseleur]

I have a suggestion for the title of this PR:

feat(webhooks): pass webhook-* annotations to webhook providers

[Raffo]

@mloiseleur yes, 100% happy to add more info. I was more wondering "is this enough" and hence why I opened it like this. I'd say that it looks enough and I'm kind of embarrassed I didn't think about it when I first worked on the webhook. Do you see anything that needs to be added for this feature to satisfy the original issue?

[Raffo]

@mloiseleur added some docs.

[mloiseleur]

Nope.
/lgtm

[Raffo]

/approve

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