webfinger controller event pass request once

[asdfzdfj]

pass the webfinger request from controller to WebfingerResponseEvent and its handlers once rather than (implicitly) pulling the request from the stack, also adjusted WebFingerParameters the same way to have it parse the params out of the given request object

just to make it clearer what's the required input, rather than magically conjuring them out of thin air (not really) on use

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perhaps could go one step further by parsing webfinger params then pass the parsed params on dispatch instead, or perhaps it should be done as pre/post event?