chore: Add consensus state heights query (cosmos#1336)

* add ConsensusStateHeights query

* add cli for ConsensusStateHeights Query

* update CHANGELOG.md

* Update modules/core/02-client/keeper/grpc_query.go

Co-authored-by: Damian Nolan <damiannolan@gmail.com>

* Update modules/core/02-client/client/cli/query.go

Co-authored-by: Damian Nolan <damiannolan@gmail.com>

* Update modules/core/02-client/client/cli/query.go

Co-authored-by: Damian Nolan <damiannolan@gmail.com>

* Update modules/core/02-client/client/cli/query.go

Co-authored-by: Damian Nolan <damiannolan@gmail.com>

* update consensus height query

* very minor changes in modules/core/02-client grpc_query_test

* Update modules/core/02-client/keeper/grpc_query_test.go

Co-authored-by: Sean King <seantking@users.noreply.github.com>

* Update modules/core/02-client/keeper/grpc_query_test.go

Co-authored-by: Sean King <seantking@users.noreply.github.com>

* Update modules/core/02-client/keeper/grpc_query_test.go

Co-authored-by: Sean King <seantking@users.noreply.github.com>

* Update modules/core/02-client/keeper/grpc_query_test.go

Co-authored-by: Sean King <seantking@users.noreply.github.com>

* Update modules/core/02-client/client/cli/query.go

Co-authored-by: Sean King <seantking@users.noreply.github.com>

* Update modules/core/02-client/keeper/grpc_query_test.go

Co-authored-by: Carlos Rodriguez <carlos@interchain.io>

* Update CHANGELOG.md

Co-authored-by: colin axnér <25233464+colin-axner@users.noreply.github.com>

* update swagger.yaml; update 02-client grpc_query_test

* Update modules/core/02-client/keeper/grpc_query_test.go

Co-authored-by: Damian Nolan <damiannolan@gmail.com>

* nit

Co-authored-by: Damian Nolan <damiannolan@gmail.com>
Co-authored-by: Sean King <seantking@users.noreply.github.com>
Co-authored-by: Carlos Rodriguez <carlos@interchain.io>
Co-authored-by: vuong <56973102+vuong177@users.noreply.github.com>
Co-authored-by: colin axnér <25233464+colin-axner@users.noreply.github.com>

CHANGELOG.md

@@ -64,6 +64,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Features
 
+* (modules/core/02-client) [\#1336](https://github.com/cosmos/ibc-go/pull/1336) Adding Query/ConsensusStateHeights gRPC for fetching the height of every consensus state associated with a client.
 * [\#276](https://github.com/cosmos/ibc-go/pull/276) Adding the Fee Middleware module v1
 * (apps/29-fee) [\#1229](https://github.com/cosmos/ibc-go/pull/1229) Adding CLI commands for getting all unrelayed incentivized packets and packet by packet-id. 
 * (apps/29-fee) [\#1224](https://github.com/cosmos/ibc-go/pull/1224) Adding Query/CounterpartyAddress and CLI to ICS29 fee middleware