allow underscores on number literals

[decioferreira]

allow underscores on number literals (eg. 10_000) syntax like ruby (ref: https://docs.ruby-lang.org/en/3.2/syntax/literals_rdoc.html#label-Number+Literals)

• https://v8.dev/features/numeric-separators
• Allow place-separating underscores for number literals a la Ruby jashkenas/coffeescript#632

[decioferreira]

There is currently a WIP branch being developed for this: abyMosa/pull/1