[chore] update otel libraries (#3740)

* chore: update otel dependencies

* refactor: combine tracing & metrics in observability package

* chore: update example tracing compose file

vendor/github.com/grpc-ecosystem/grpc-gateway/v2/utilities/pattern.go

@@ -1,6 +1,6 @@
 package utilities
 
-// An OpCode is a opcode of compiled path patterns.
+// OpCode is an opcode of compiled path patterns.
 type OpCode int
 
 // These constants are the valid values of OpCode.

vendor/github.com/grpc-ecosystem/grpc-gateway/v2/utilities/string_array_flag.go

@@ -5,7 +5,7 @@ import (
 	"strings"
 )
 
-// flagInterface is an cut down interface to `flag`
+// flagInterface is a cut down interface to `flag`
 type flagInterface interface {
 	Var(value flag.Value, name string, usage string)
 }