Add x/upgrade gRPC query for module VersionMap

[amaury1093]

Summary

Add x/upgrade gRPC query for module VersionMap

ref: ADR-041 and #8743 (review)

Problem Definition

There's no way to query the current module.VersionMap stored in x/upgrade state.

Proposal

Add a gRPC method in the x/upgrade Query service.

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[technicallyty]

Should it be as simple as querying for the entire version map, or should we add methods to ask for a specific module / set of modules?

[amaury1093]

Maybe the request message could have one module string field, if it's set then query the version of that module, if not, then query whole map. Is this a common/intuitive practise? wdyt?