feat: Conditionally emit metrics based on enablement (backport #19903) (#20017)

Co-authored-by: Lucas Francisco López <lucaslopezf@gmail.com>
Co-authored-by: Julien Robert <julien@rbrt.fr>

client/v2/go.mod

@@ -6,6 +6,7 @@ require (
 	cosmossdk.io/api v0.7.3
 	cosmossdk.io/core v0.11.0
 	cosmossdk.io/depinject v1.0.0-alpha.4
+	cosmossdk.io/math v1.3.0
 	cosmossdk.io/x/tx v0.13.1
 	github.com/cockroachdb/errors v1.11.1
 	github.com/cosmos/cosmos-proto v1.0.0-beta.4
@@ -22,7 +23,6 @@ require (
 	cosmossdk.io/collections v0.4.0 // indirect
 	cosmossdk.io/errors v1.0.1 // indirect
 	cosmossdk.io/log v1.3.1 // indirect
-	cosmossdk.io/math v1.3.0 // indirect
 	cosmossdk.io/store v1.1.0 // indirect
 	filippo.io/edwards25519 v1.0.0 // indirect
 	github.com/99designs/go-keychain v0.0.0-20191008050251-8e49817e8af4 // indirect