Add method to convert NumberLiteral type and/or stringify without type suffix

[straight-shoota]

Stringifying a NumberLiteral always adds a the type suffix unless the type is Int32 (which is the default).

{% p 1_u8.id %} # => 1_u8

It seems there is currently no way to remove that type suffix, for example for cleanly stringifying the value (see #10460).

A good solution is probably adding NumberLiteral#to_i to converts to an Int32 literal which is without type suffix. This can than be used to stringify or construct other number literals.