feat: add query groups in x/group (backport #14879)

[mergify]

This is an automatic backport of pull request #14879 done by Mergify.
Cherry-pick of a2797c8 has failed:

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Changes to be committed:
	modified:   api/cosmos/group/v1/query.pulsar.go
	modified:   api/cosmos/group/v1/query_grpc.pb.go
	modified:   api/cosmos/orm/module/v1alpha1/module.pulsar.go
	modified:   proto/cosmos/group/v1/query.proto
	modified:   tests/e2e/group/query.go
	modified:   x/group/client/cli/query.go
	modified:   x/group/keeper/grpc_query.go
	modified:   x/group/query.pb.go
	modified:   x/group/query.pb.gw.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   CHANGELOG.md
	both modified:   x/group/keeper/grpc_query_test.go

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[julienrbrt]

Let's wait for #15480 to be merged, so we can see clearer the changes here (due to the make proto-gen blob #15480 (comment), it makes it hard to check otherwise)

[julienrbrt]

tACK