otel: add redisotel.InstrumentTracing

[glimchb]

in cmd/main.go

store, err := utils.InitStore(redisAddress)
if err != nil {
	log.Panic(err)
}

in utils/redis.go

import (
	"github.com/redis/go-redis/v9"
	"github.com/redis/go-redis/extra/redisotel/v9"
	"github.com/philippgille/gokv
	gokvredis "github.com/philippgille/gokv/redis"
)

func InitStore(address string) (*gokv.Store, error) {
	rdb := redis.NewClient(&redis.Options{
		Addr:     address,
	    Password: "", // no password set
	    DB:       0,  // use default DB
	})
	err := rdb.Ping().Err()
	if err != nil {
		return nil, err
	}
	if err := redisotel.InstrumentTracing(rdb); err != nil {
		return nil, err
	}
	if err := redisotel.InstrumentMetrics(rdb); err != nil {
		return nil, err
	}
	store := &gokvredis.Client{c: rdb, codec: utils.ProtoCodec{}}
	return store, nil
}