Add e2e tests for gRPC requests and CLI commands (#13)

- Add E2E tests following pattern suggested in cosmos-sdk docs:
  https://docs.cosmos.network/v0.50/build/building-modules/testing#end-to-end-tests
  - Tests for gRPC requests
  - Tests for manually configured CLI commands
- Add a CI workflow to run these E2E tests

Reviewed-on: deep-stack/laconic2d#13
Co-authored-by: Prathamesh Musale <prathamesh.musale0@gmail.com>
Co-committed-by: Prathamesh Musale <prathamesh.musale0@gmail.com>

api/cerc/bond/v1/genesis.pulsar.go

@@ -608,7 +608,6 @@ type GenesisState struct {
 	// params defines all the parameters of the module.
 	Params *Params `protobuf:"bytes,1,opt,name=params,proto3" json:"params,omitempty"`
 	// bonds defines all the bonds
-	// TODO: Add nullable = false ?
 	Bonds []*Bond `protobuf:"bytes,2,rep,name=bonds,proto3" json:"bonds,omitempty"`
 }