This commit refactors the syntax of "ugly" attribute/type formats to not use strings for wrapping. This means that moving forward attirbutes and type formats will always need to be in some recognizable form, i.e. if they use incompatible characters they will need to manually wrap those in a string, the framework will no longer do it automatically. This has the benefit of greatly simplifying how parsing attributes/types work, given that we currently rely on some extremely complicated nested parser logic which is quite problematic for a myriad of reasons; unecessary complexity(we create a nested source manager/lexer/etc.), diagnostic locations can be off/wrong given string escaping, etc. Differential Revision: https://reviews.llvm.org/D118505
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