[flang][nfc] Support volatile on ref, box, and class types (#134386) Part one of merging #132486. Add support for representing volatility in the type system for reference, box, and class types. Don't do anything with volatile just yet, only support and test their representation and utility functions. The naming convention is a little goofy - `fir::isa_volatile_type` and `fir::updateTypeWithVolatility` use different capitalization, but I put them near similar functions and tried to match the surrounding conventions and [the docs](https://github.com/llvm/llvm-project/blob/main/flang/docs/C%2B%2Bstyle.md#naming) best I could.
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