expose token flags and numeric flags

[Kingwl]

Fixes #29891

[weswigham]

Does ContainsSeparator need to be public if , eg, ExtendedUnicodeEscape isn't?

[Kingwl]

@weswigham
Actually, i'm not sure that which Flag should we expose, Could you give some suggestion?

[OzelotVanilla]

Sorry for replying this already closed pull request. I am writing a transpiler using TS Compiler API, and I come from web searching. I would like to notice that in at least typescript@5.7.2, numericLiteralFlags does not exist in interface NumericLiteral (in the file typescript.d.ts). I want to ask if it is done on purpose, or ?

Currently the generated typescript.d.ts files looks like this (should we have numericLiteralFlags being defined here ?):

    interface NumericLiteral extends LiteralExpression, Declaration {
        readonly kind: SyntaxKind.NumericLiteral;
    }

I searched the repository and I cannot find where the NumericLiteral is defined. Sorry that I cannot create a pull request for that.