feat: Add support for function variants and fixups in Mach-O file par…

…sing

- Introduced FunctionVariants and FunctionVariantFixups load commands.
- Implemented methods to retrieve and parse function variants and fixups data.
- Enhanced symbol resolution for function variants based on CPU features.
- Added new types and constants for ARM64 and x86_64 CPU feature flags.
- Updated stringer generation for new types and commands.
- Modified the Enrich method to include function variants and fixups parsing.
- Improved error handling for missing load commands.

fix(objc): add support for reading UTF-16 encoded CFStrings #78

feat(objc): add support for class properties in protocols

feat(objc): add support for optional class properties in protocols

chore: error fmt tweak

fix: objc parsing (relative offset calculation bug + bounds checking)

feat: support Swift auto demangling hooks

fix: enhance Swift support with new type handling and symbolic name r…

…esolution + add support for empty strings back

fix: objc metadata cstring parsing

feat: add target Lookup to fixupchains