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/internal/handler/pinghandler.go

@@ -0,0 +1,29 @@
+package handler
+
+import (
+	"net/http"
+
+	"git.cialloo.com/CiallooWeb/ServerStatistics/app/internal/logic"
+	"git.cialloo.com/CiallooWeb/ServerStatistics/app/internal/svc"
+	"git.cialloo.com/CiallooWeb/ServerStatistics/app/internal/types"
+	"github.com/zeromicro/go-zero/rest/httpx"
+)
+
+// Ping the server to check if it's alive
+func pingHandler(svcCtx *svc.ServiceContext) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		var req types.PingReq
+		if err := httpx.Parse(r, &req); err != nil {
+			httpx.ErrorCtx(r.Context(), w, err)
+			return
+		}
+
+		l := logic.NewPingLogic(r.Context(), svcCtx)
+		resp, err := l.Ping(&req)
+		if err != nil {
+			httpx.ErrorCtx(r.Context(), w, err)
+		} else {
+			httpx.OkJsonCtx(r.Context(), w, resp)
+		}
+	}
+}