add benchmarks for ids (#816)

... I was curious

api/id/id_test.go

@@ -0,0 +1,30 @@
+package id
+
+import (
+	"testing"
+)
+
+func BenchmarkGen(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		id := New()
+		_ = id
+	}
+}
+
+func BenchmarkMarshalText(b *testing.B) {
+	id := New()
+	for i := 0; i < b.N; i++ {
+		byts, _ := id.MarshalText()
+		_ = byts
+	}
+}
+
+func BenchmarkUnmarshalText(b *testing.B) {
+	id := New()
+	byts, _ := id.MarshalText()
+	for i := 0; i < b.N; i++ {
+		var id Id
+		id.UnmarshalText(byts)
+		_ = id
+	}
+}