refactor: use google.protobuf.Timestamp instead of int64

Replaced the int64 timestamp with google.protobuf.Timestamp in the GetIdsResponse message. Adjusted the generated code to handle the new timestamp type and updated the protobuf imports accordingly.

proto/da/da.proto

@@ -1,6 +1,8 @@
 syntax = "proto3";
 package da;
 
+import "google/protobuf/timestamp.proto";
+
 // DAService is the protobuf service definition for interaction with Data Availability layers.
 service DAService {
     // MaxBlobSize returns the maximum blob size
@@ -79,7 +81,7 @@ message GetIdsRequest {
 // GetIdsResponse is the response type for the GetIds rpc method.
 message GetIdsResponse {
 	repeated ID ids = 1;
-  int64 timestamp = 2;
+  google.protobuf.Timestamp timestamp = 2;
 }
 
 // GetProofsRequest is the request type for the GetProofs rpc method.

proxy/grpc/client.go

@@ -2,8 +2,8 @@ package grpc
 
 import (
 	"context"
-	"time"
 
+	"github.com/cosmos/gogoproto/types"
 	"google.golang.org/grpc"
 
 	"github.com/rollkit/go-da"
@@ -73,7 +73,11 @@ func (c *Client) GetIDs(ctx context.Context, height uint64, namespace da.Namespa
 		return nil, err
 	}
 
-	return &da.GetIDsResult{IDs: idsPB2DA(resp.Ids), Timestamp: time.UnixMicro(resp.Timestamp)}, nil
+	timestamp, err := types.TimestampFromProto(resp.Timestamp)
+	if err != nil {
+		return nil, err
+	}
+	return &da.GetIDsResult{IDs: idsPB2DA(resp.Ids), Timestamp: timestamp}, nil
 }
 
 // GetProofs returns inclusion Proofs for all Blobs located in DA at given height.

proxy/grpc/server.go

@@ -3,6 +3,7 @@ package grpc
 import (
 	"context"
 
+	"github.com/cosmos/gogoproto/types"
 	"google.golang.org/grpc"
 
 	"github.com/rollkit/go-da"
@@ -43,7 +44,11 @@ func (p *proxySrv) GetIds(ctx context.Context, request *pbda.GetIdsRequest) (*pb
 		return nil, err
 	}
 
-	return &pbda.GetIdsResponse{Ids: idsDA2PB(ret.IDs), Timestamp: ret.Timestamp.UnixMicro()}, nil
+	timestamp, err := types.TimestampProto(ret.Timestamp)
+	if err != nil {
+		return nil, err
+	}
+	return &pbda.GetIdsResponse{Ids: idsDA2PB(ret.IDs), Timestamp: timestamp}, nil
 }
 
 func (p *proxySrv) Commit(ctx context.Context, request *pbda.CommitRequest) (*pbda.CommitResponse, error) {