Update the version of swift-argument-parser used by swift-inspect to
be compatible with the package description version.
Add compiler flags for a LLVM bug workaround.
Use the HeapWalk API for heap iteration instead of the
Heap32First/Next API, which was known to be slow. Since HeapWalk only
works locally, it requires using a remote thread and a DLL.
This restructures and refactors the project to split up the
implementation into smaller fragments. The majority of the operations
are portable: the ones which are not require iterating the heap
allocations which is not guaranteed to be a portable operation.
Additionally, the `Inspector` class is renamed into `RemoteProcess`
which is also converted to a protocol to allow adding in an
implementation for other targets. The inspection operations are split
off into individual files to make it easier to follow. Take the
opportunity to use `@main` for the entry point.
