Generic type parameter values with parenthese types cause invalid syntax

[jeparlefrancais]

When processing a type like this:

type _fieldDefStack = Array<GraphQLField<any, any>? | NULL>

Darklua currently adds parentheses around GraphQLField<any, any>? which creates invalid syntax:

type _fieldDefStack = Array<(GraphQLField<any, any>?) | NULL> -- invalid in Luau!

This is odd because the syntax defines type params as:

TypeParams = (Type | TypePack | VariadicTypePack | GenericTypePack) [',' TypeParams]

Which makes ``(GraphQLField<any, any>?) | NULL` a valid type. Luau also agrees that this is correct syntax, as it accepts this type declaration:

type _fieldDefStack = (GraphQLField<any, any>?) | NULL

It seems like the fix for this would be to wrap the type params values in a parenthese when they contain a type union or intersection where the left side type is a parenthese type. Weirdly specific thing to add, but I think it'll do it.