Refactor authorized propose functions

They were getting spaghetti so;

new function: handlers::authorize_proposer(), handles the jwt stuff, NOT
async and _may_ cause trouble down the road but then again the stuff it
does used to be (repeated) in the functions so how bad can it be

If else chains were getting unwieldy;
https://refactoring.com/catalog/replaceNestedConditionalWithGuardClauses.html

so now everything is returning early, might make verbose error handling
easier

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