feat: add total player count and total playtime logic

- Implemented TotalPlayerCountLogic to retrieve the total number of unique players within a specified time range.
- Implemented TotalPlayTimeLogic to calculate the total playtime of players within a specified time range.
- Created ServiceContext to manage database connections and initialize necessary tables.
- Added types for total player count and total playtime requests and responses.
- Set up the main server file to start the application with the necessary configurations.
- Updated go.mod and go.sum for new dependencies.

app/serverstatistics.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+
+	"git.cialloo.com/CiallooWeb/ServerStatistics/app/internal/config"
+	"git.cialloo.com/CiallooWeb/ServerStatistics/app/internal/handler"
+	"git.cialloo.com/CiallooWeb/ServerStatistics/app/internal/svc"
+
+	"github.com/zeromicro/go-zero/core/conf"
+	"github.com/zeromicro/go-zero/rest"
+)
+
+var configFile = flag.String("f", "etc/serverstatistics.yaml", "the config file")
+
+func main() {
+	flag.Parse()
+
+	var c config.Config
+	conf.MustLoad(*configFile, &c, conf.UseEnv())
+
+	server := rest.MustNewServer(c.RestConf)
+	defer server.Stop()
+
+	ctx := svc.NewServiceContext(c)
+	handler.RegisterHandlers(server, ctx)
+
+	fmt.Printf("Starting server at %s:%d...\n", c.Host, c.Port)
+	server.Start()
+}