Fix/Implement runtime queries in v2

[julienrbrt]

It looks like runtime queries do not work in v2.
This is crucial to have it working for tools like Hubl / Ignite Connect.

Step to reproduce:

$ simdv2 q runtime autocli app-options
error in json rpc client, with http response metadata: (Status: 200 OK, Protocol HTTP/1.1). RPC error -32603 - Internal error: no query handler found for /cosmos.autocli.v1.Query/AppOptions
$ simdv2 q runtime config
error in json rpc client, with http response metadata: (Status: 200 OK, Protocol HTTP/1.1). RPC error -32603 - Internal error: no query handler found for /cosmos.app.v1alpha1.Query/Config
$  simdv2 q runtime reflection file-descriptors
error in json rpc client, with http response metadata: (Status: 200 OK, Protocol HTTP/1.1). RPC error -32603 - Internal error: no query handler found for /cosmos.reflection.v1.ReflectionService/FileDescriptors

Once it works, the following should be uncommented: https://github.com/cosmos/cosmos-sdk/blob/c79e19d/tests/systemtests/grpc_test.go#L53