Add transpiler option that toggles whether or not class properties WITHOUT default values are set to Invalid

[addison-adler]

⚠️ Note:
This is something I'm working on a PR for 🙂

Context

Currently, if you implement a class with a property that does not have a default value, Bsc is setting the value = invalid

Example

Class A
    fieldA as String

    Function new ()
    End Function
End Class

Transpiles to

function __A_builder()
    instance = {}
    instance.new = Function()
        m.fieldA = invalid
    End Function
    return instance
end function

function A()
    instance = __A_builder()
    instance.new()
    return instance
end function

Reason

Discussed with Bronley. Will add details here later!