repl: add new language features to top level await statements

This adds stage-3 language features to acorn so that it's possible
to parse these features when using top level await in the REPL.

PR-URL: https://github.com/nodejs/node/pull/27400
Refs: https://github.com/nodejs/node/issues/27391
Refs: https://github.com/nodejs/node/issues/25835


Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Michaël Zasso <targos@protonmail.com>