Add pre-propose-approval support for multiple choice proposals, and freeze approver #883
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this does two things:
it creates a dao-pre-propose-approval-multiple contract so that multiple choice proposal modules can have approvers, just like single choice proposal modules. it also ensures the approver contract works for both approval-single and approval-multiple
it freezes the
approver
in the proposal so that a previously created pending proposal does not change approvers if the approver gets updated while it's still pending. this maintains consistency with other DAO logic to keep things intuitive, where the members who can vote on a proposal are frozen upon proposal creation.