Transform class static block (#12143)

Co-authored-by: Nicolò Ribaudo <nicolo.ribaudo@gmail.com>
Co-authored-by: Brian Ng <bng412@gmail.com>

packages/babel-standalone/scripts/pluginConfig.json

@@ -2,6 +2,7 @@
   "external-helpers",
   "syntax-async-generators",
   "syntax-class-properties",
+  "syntax-class-static-block",
   "syntax-decimal",
   "syntax-decorators",
   "syntax-do-expressions",
@@ -20,6 +21,7 @@
   "syntax-typescript",
   "proposal-async-generator-functions",
   "proposal-class-properties",
+  "proposal-class-static-block",
   "proposal-decorators",
   "proposal-do-expressions",
   "proposal-dynamic-import",