Review all queries that return lists

[webmaster128]

• StakingQuery::AllValidators (Add pagination support for AllValidatorsQuery wasmvm#268)
• StakingQuery::AllDelegations
• Deprecate query BankQuery::AllBalances #2231
• BankQuery::AllDenomMetadata
• Deprecate IbcQuery::ListChannels #2222

[chipshort]

BankQuery::AllDenomMetadata is already paginated (optionally at least).

All of them should be paginated imo, because the contract has no control over the amount of return values for all of them. Specifically token factory and ibc tokens are turning some of these into a footgun when not paginated.
The only partial exceptions to this are AllDelegations and ListChannels, where the contract can at least control the amount of return values for its own address, but any user-controlled address is still highly problematic.

The problem with this is that we cannot introduce pagination now without breaking contract code or doing some very ugly stuff. We can use Option<PageRequest> and default to None to avoid breaking deployed contracts, but source code breakage is impossible to avoid because the query variants are not marked as #[non_exhaustive].

[webmaster128]

I would say we proceed with AllBalances the same way as with ListChannels. It just cannot be advised to load all denoms for an address if denom generation is practically permissionless.