feat: use gatekeeper per poll

[ctrlc03]

Description

Use a gatekeeper per each poll so that each can have its own gatekeeping (maci level more general, poll more specific)

Related issue(s)

fix #1858

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[0xmad]

@ctrlc03 thanks, just one suggestion.

[kittybest]

Thanks! Just left a comment.
btw, I'm curious about if this PR would affect the user need to signup to each poll everytime? would it be possible that some polls wanna share the same signup information, only few of them wanna have their own gatekeeper? or is this because of the anon poll joining?
Just thinking about if one wanna attend 10 polls of a single event (let's say Devcon, for example), maybe the user don't want to sign up 10 times?

[ctrlc03]

only few of them wanna have their own gatekeeper

yes correct, in most cases this might be free for all

or is this because of the anon poll joining

Yes The poll joining is for the anon poll joining flow, so that you can join with a new anonymous key for each poll

Just thinking about if one wanna attend 10 polls of a single event (let's say Devcon, for example), maybe the user don't want to sign up 10 times?

that might change in the future but will need some re-design, for now it can be made as smooth as possible to avoid affecting UX

[0xmad]

@ctrlc03 thanks!