feat: anonymous telemetry

anonymous in this case meaning we can't trace it back to a particular
user

THIS IS UNTESTED AND HEAVILY WORK IN PROGRESS.

routes/telemetry.go

@@ -0,0 +1,44 @@
+package routes
+
+import (
+	"time"
+
+	"github.com/gofiber/fiber/v2"
+
+	g "github.com/vencord/backend/globals"
+	"github.com/vencord/backend/util"
+)
+
+type TelemetryBody struct {
+	Plugins         []string `json:"plugins"`
+	Version         string   `json:"version"`
+	OperatingSystem string   `json:"operatingSystem"`
+}
+
+func POSTTelemetry(c *fiber.Ctx) error {
+	telemetry := new(TelemetryBody)
+
+	if err := c.BodyParser(telemetry); err != nil {
+		return err
+	}
+
+	telemetryId := util.Hash(g.PEPPER_TELEMETRY + c.IP())
+
+	_, err := g.RDB.HSet(c.Context(), "telemetry:"+telemetryId, map[string]interface{}{
+		"plugins":         telemetry.Plugins,
+		"version":         telemetry.Version,
+		"operatingSystem": telemetry.OperatingSystem,
+	}).Result()
+
+	if err != nil {
+		panic(err)
+	}
+
+	_, err = g.RDB.Expire(c.Context(), "telemetry:"+telemetryId, 3*24*time.Hour).Result()
+
+	if err != nil {
+		panic(err)
+	}
+
+	return c.SendStatus(204)
+}