feat: Snapshot exporting tool (#1877)

In this PR:
1 We create a golang grpc client to request data from rippled
2 We store the data into the specific place
3 Add unittests
4 Create build script, the build can be initiated by set conan option
`snapshot` being true.

Please ignore the grpc server part. It will be implemented in importing
tool.

tools/snapshot/internal/parse_args/parse_args.go

@@ -0,0 +1,63 @@
+package parse_args
+
+import (
+	"fmt"
+	"os"
+
+	flag "github.com/spf13/pflag"
+)
+
+type Args struct {
+	ExportMode string
+	StartSeq   uint32
+	EndSeq     uint32
+	Path       string
+	GrpcServer string
+	ServerMode bool
+	GrpcPort   uint32
+	WsPort     uint32
+}
+
+func Parse() (*Args, error) {
+
+	fs := flag.NewFlagSet(os.Args[0], flag.ContinueOnError)
+	fs.Usage = PrintUsage
+
+	exportMode := fs.StringP("export", "e", "", "Set export mode: 'full' (export full ledger data of start_seq) or 'delta' (only export ledger diff data)")
+	seq := fs.Uint32("start_seq", 0, "Starting sequence number")
+	endSeq := fs.Uint32("end_seq", 0, "Ending sequence number")
+	path := fs.StringP("path", "p", "", "Path to the data")
+	grpcServer := fs.StringP("grpc_server", "g", "localhost:50051", "rippled's gRPC server address")
+	serverMode := fs.BoolP("server", "s", false, "Start server mode")
+	grpcPort := fs.Uint32("grpc_port", 0, "Port for gRPC server to listen on")
+	wsPort := fs.Uint32("ws_port", 0, "Port for WebSocket server to listen on")
+	fs.Parse(os.Args[1:])
+
+	if *serverMode && *exportMode != "" {
+		return nil, fmt.Errorf("Invalid usage: --server and --export cannot be used at the same time.")
+	}
+
+	if *serverMode {
+		if *grpcPort == 0 || *wsPort == 0 || *path == "" {
+			return nil, fmt.Errorf("Invalid usage: --grpc_port and --ws_port and --path are required for server mode.")
+		}
+	} else if *exportMode != "" {
+		if *exportMode == "full" || *exportMode == "delta" {
+			if *seq == 0 || *endSeq == 0 || *path == "" || *grpcServer == "" {
+				return nil, fmt.Errorf("Invalid usage: --start_seq, --end_seq, --grpc_server and --path are required for export")
+			}
+		} else {
+			return nil, fmt.Errorf("Invalid usage: Invalid export mode. Use 'full' or 'delta'.")
+		}
+	} else {
+		return nil, fmt.Errorf("Invalid usage: --export or --server flag is required.")
+	}
+
+	return &Args{*exportMode, *seq, *endSeq, *path, *grpcServer, *serverMode, *grpcPort, *wsPort}, nil
+}
+
+func PrintUsage() {
+	fmt.Println("Usage: clio_snapshot [options]")
+	fmt.Println("Options:")
+	flag.PrintDefaults()
+}