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This adds checks to `HandleCommunityRequestToJoin` and `AcceptRequestToJoinCommunity` that ensure a given user's revealed wallet addresses own the token funds required by a community. When community has token permissions of type `BECOME_MEMBER`, the following happens when the owner receives a request: 1. Upon verifying provided wallet addresses by the requester, the owner node accumulates all token funds related to the given wallets that match the token criteria in the configured permissions 2. If the requester does not meet the necessary requirements, the request to join will be declined. If the requester does have the funds, he'll either be automatically accepted to the community, or enters the next stage where an owner needs to manually accept the request. 3. The the community does not automatically accept users, then the funds check will happen again, when the owner tries to manually accept the request. If the necessary funds do not exist at this stage, the request will be declined 4. Upon accepting, whether automatically or manually, the owner adds the requester's wallet addresses to the `CommunityDescription`, such that they can be retrieved later when doing periodic checks or when permissions have changed.