chore: Add "Since:" on proto doc comments (#10434)

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## Description

ref: https://github.com/cosmos/cosmos-sdk/discussions/10406#discussioncomment-1533289

For clients to know whether a protobuf feature is available for a certain SDK version, we decided to use the [`@since` doc comment](https://www.oracle.com/technical-resources/articles/java/javadoc-tool.html#@since) inside protobuf files.

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---

### Author Checklist

*All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.*

I have...

- [ ] 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
- [ ] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#pr-targeting))
- [ ] provided a link to the relevant issue or specification
- [ ] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules)
- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#testing)
- [ ] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [ ] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed

### Reviewers Checklist

*All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.*

I have...

- [ ] 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
- [ ] confirmed all author checklist items have been addressed 
- [ ] reviewed state machine logic
- [ ] reviewed API design and naming
- [ ] reviewed documentation is accurate
- [ ] reviewed tests and test coverage
- [ ] manually tested (if applicable)

x/auth/types/query.pb.go

@@ -33,6 +33,8 @@ var _ = math.Inf
 const _ = proto.GoGoProtoPackageIsVersion3 // please upgrade the proto package
 
 // QueryAccountsRequest is the request type for the Query/Accounts RPC method.
+//
+// Since: cosmos-sdk 0.43
 type QueryAccountsRequest struct {
 	// pagination defines an optional pagination for the request.
 	Pagination *query.PageRequest `protobuf:"bytes,1,opt,name=pagination,proto3" json:"pagination,omitempty"`
@@ -79,6 +81,8 @@ func (m *QueryAccountsRequest) GetPagination() *query.PageRequest {
 }
 
 // QueryAccountsResponse is the response type for the Query/Accounts RPC method.
+//
+// Since: cosmos-sdk 0.43
 type QueryAccountsResponse struct {
 	// accounts are the existing accounts
 	Accounts []*types.Any `protobuf:"bytes,1,rep,name=accounts,proto3" json:"accounts,omitempty"`
@@ -732,6 +736,8 @@ const _ = grpc.SupportPackageIsVersion4
 // For semantics around ctx use and closing/ending streaming RPCs, please refer to https://godoc.org/google.golang.org/grpc#ClientConn.NewStream.
 type QueryClient interface {
 	// Accounts returns all the existing accounts
+	//
+	// Since: cosmos-sdk 0.43
 	Accounts(ctx context.Context, in *QueryAccountsRequest, opts ...grpc.CallOption) (*QueryAccountsResponse, error)
 	// Account returns account details based on address.
 	Account(ctx context.Context, in *QueryAccountRequest, opts ...grpc.CallOption) (*QueryAccountResponse, error)
@@ -821,6 +827,8 @@ func (c *queryClient) AddressStringToBytes(ctx context.Context, in *AddressStrin
 // QueryServer is the server API for Query service.
 type QueryServer interface {
 	// Accounts returns all the existing accounts
+	//
+	// Since: cosmos-sdk 0.43
 	Accounts(context.Context, *QueryAccountsRequest) (*QueryAccountsResponse, error)
 	// Account returns account details based on address.
 	Account(context.Context, *QueryAccountRequest) (*QueryAccountResponse, error)

x/auth/vesting/types/vesting.pb.go

@@ -241,6 +241,8 @@ var xxx_messageInfo_PeriodicVestingAccount proto.InternalMessageInfo
 // PermanentLockedAccount implements the VestingAccount interface. It does
 // not ever release coins, locking them indefinitely. Coins in this account can
 // still be used for delegating and for governance votes even while locked.
+//
+// Since: cosmos-sdk 0.43
 type PermanentLockedAccount struct {
 	*BaseVestingAccount `protobuf:"bytes,1,opt,name=base_vesting_account,json=baseVestingAccount,proto3,embedded=base_vesting_account" json:"base_vesting_account,omitempty"`
 }