Feat/sink interface

[maurafortino]

1. sinkwrapper client interface will be replace by the sink interface
2. the sink interface will have the following funcs (update(l Listener), send(urls *ring.Ring, secret, acceptType string, msg *wrp.Message))
3. the webhook abstraction will be renamed to something like matcher since it's main purpose is to match incoming messages to desired events or wrp field regex

[guardrails]

All previously detected findings have been fixed. Good job! 👍🎉

We will keep this comment up-to-date as you go along and notify you of any security issues that we identify.

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[denopink]

lgtm!
left some suggestions