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>

proto/cerc/auction/v1/query.proto

@@ -123,8 +123,6 @@ message QueryAuctionsByBidderRequest {
 message QueryAuctionsByBidderResponse {
   // List of auctions
   Auctions auctions = 1;
-
-  // TODO: Add pagination?
 }
 
 // AuctionsByOwnerRequest is the format for querying all auctions created by an owner

proto/cerc/bond/v1/genesis.proto

@@ -13,6 +13,5 @@ message GenesisState {
   Params params = 1 [(gogoproto.nullable) = false];
 
   // bonds defines all the bonds
-  // TODO: Add nullable = false ?
   repeated Bond bonds = 2 [(gogoproto.moretags) = "json:\"bonds\" yaml:\"bonds\""];
 }