Create class-based version of webhook decorator

[pydanny]

Rather than use decorators on functions, allow users to implement via classes.

Sample API that I'm not happy with so I'm still thinking about it

class Basic(BaseWebhook):

    def send(wife: Object, husband: Object):
        return {"husband": husband, "wife": wife}

    def recorder(self):
        # Call out to persistence

basic = Basic(url, encoding, timeout, custom_headers, signing_secret)
basic.send(husband, wife)