Need a way to disable arg marshalling for decorators

[timotheeguerin]

Clear and concise description of the problem

There is some decorators what would want to get the original value non marshalled(like the @example decorator).

There is a few options:

1. add a getRawArg(index: number): Entity on the DecoratorContext. - Problem is you cannot call then a decorator with context.call() that depend on this.
2. Add a $example.disableArgMarshalling - Problem is that tspd then cannot generate the right signature for this decorator as it won't know about this flag.
3. Add a modifier on the decorator declaration extern raw dec example(target, value: valueof unknown)

Checklist

• Follow our Code of Conduct
• Read the docs.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[steverice]

@timotheeguerin I think this was inadvertently closed when #6947 was merged.

[timotheeguerin]

ah yeah oops