Update instrumentation naming

[MrAlias]

Instrumentation renames:

• google.golang.org/grpc -> google.golang.org/grpc/otelgrpc
• go.mongodb.org/mongo-driver -> go.mongodb.org/mongo-driver/mongo/otelmongo
• net/http -> net/http/otelhttp
• net/http/httptrace -> net/http/httptrace/otelhttptrace
• github.com/labstack/echo -> github.com/labstack/echo/otelecho
• github.com/bradfitz/gomemcache -> github.com/bradfitz/gomemcache/memcache/otelmemcache
• github.com/gin-gonic/gin -> github.com/gin-gonic/gin/otelgin
• github.com/gocql/gocql -> github.com/gocql/gocql/otelgocql
• github.com/emicklei/go-restful -> github.com/emicklei/go-restful/otelrestful
• github.com/Shopify/sarama -> github.com/Shopify/sarama/otelsarama
• github.com/gorilla/mux -> github.com/gorilla/mux/otelmux
• github.com/astaxie/beego -> github.com/astaxie/beego/otelbeego
• gopkg.in/macaron.v1 -> gopkg.in/macaron.v1/otelmacaron

Superseeds #314
Resolves #164

[XSAM]

🚀

[MrAlias]

Going to merge given this was a discussed change and the large number of files it touches is at high risk for conflicts.