fix: query account balance by ibc denom (backport #10394) (#10524)

* fix: query account balance by ibc denom (#10394)

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## Description

Closes: #10381

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---

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- [ ] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] added `!` to the type prefix if API or client breaking change
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- [ ] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
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- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
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- [ ] manually tested (if applicable)

(cherry picked from commit 99c5230)

# Conflicts:
#	CHANGELOG.md
#	docs/core/proto-docs.md
#	proto/cosmos/bank/v1beta1/query.proto
#	x/bank/types/query.pb.go
#	x/bank/types/query.pb.gw.go

* solve conflicts

* solve conflicts

Co-authored-by: Sai Kumar <17549398+gsk967@users.noreply.github.com>
Co-authored-by: marbar3778 <marbar3778@yahoo.com>

CHANGELOG.md

@@ -45,6 +45,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 ### Bug Fixes
 
 * (client) [#10226](https://github.com/cosmos/cosmos-sdk/pull/10226) Fix --home flag parsing. 
+* [\#10394](https://github.com/cosmos/cosmos-sdk/issues/10394) Fixes issue related to grpc-gateway of account balance by ibc-denom.
 
 ## [v0.42.10](https://github.com/cosmos/cosmos-sdk/releases/tag/v0.42.10) - 2021-09-28
 

docs/core/proto-docs.md

@@ -9999,4 +9999,3 @@ that implements Misbehaviour interface expected by ICS-02
 | <a name="bool" /> bool |  | bool | boolean | boolean | bool | bool | boolean | TrueClass/FalseClass |
 | <a name="string" /> string | A string must always contain UTF-8 encoded or 7-bit ASCII text. | string | String | str/unicode | string | string | string | String (UTF-8) |
 | <a name="bytes" /> bytes | May contain any arbitrary sequence of bytes. | string | ByteString | str | []byte | ByteString | string | String (ASCII-8BIT) |
-

proto/cosmos/bank/v1beta1/query.proto

@@ -13,7 +13,7 @@ option go_package = "github.com/cosmos/cosmos-sdk/x/bank/types";
 service Query {
   // Balance queries the balance of a single coin for a single account.
   rpc Balance(QueryBalanceRequest) returns (QueryBalanceResponse) {
-    option (google.api.http).get = "/cosmos/bank/v1beta1/balances/{address}/{denom}";
+    option (google.api.http).get = "/cosmos/bank/v1beta1/balances/{address}/by_denom";
   }
 
   // AllBalances queries the balance of all coins for a single account.

x/bank/client/rest/grpc_query_test.go

@@ -227,7 +227,7 @@ func (s *IntegrationTestSuite) TestBalancesGRPCHandler() {
 		},
 		{
 			"gPRC account balance of a denom",
-			fmt.Sprintf("%s/cosmos/bank/v1beta1/balances/%s/%s", baseURL, val.Address.String(), s.cfg.BondDenom),
+			fmt.Sprintf("%s/cosmos/bank/v1beta1/balances/%s/by_denom?denom=%s", baseURL, val.Address.String(), s.cfg.BondDenom),
 			&types.QueryBalanceResponse{},
 			&types.QueryBalanceResponse{
 				Balance: &sdk.Coin{
@@ -238,7 +238,7 @@ func (s *IntegrationTestSuite) TestBalancesGRPCHandler() {
 		},
 		{
 			"gPRC account balance of a bogus denom",
-			fmt.Sprintf("%s/cosmos/bank/v1beta1/balances/%s/foobar", baseURL, val.Address.String()),
+			fmt.Sprintf("%s/cosmos/bank/v1beta1/balances/%s/by_denom?denom=foobar", baseURL, val.Address.String()),
 			&types.QueryBalanceResponse{},
 			&types.QueryBalanceResponse{
 				Balance: &sdk.Coin{