feat: add bundle-stats, list-files bundle ID

`list-files` now has a `--bundle-mapping` option to emit a CSV detailing
for each entry the bundle ID, the file path, and the bundle path.

feat: add CLI option for (no-)mmap VFS I/O

Some platforms may be fine with memory-mapped I/O and shouldn't suffer
because Windows is silly. The default is still file-based I/O and the
user can be explicit with `--mmap` and `--no-mmap` to indicate their
preference.

fix: skip missing file extraction

Missing files were not skipped and could end up extracted with stack
garbage as their bundle IDs, path hashes and offsets/sizes.

This can manifest even with `path_rep` file lists as sometimes files
are just not bundled up as file entries but still have path entries.

We now explicitly skip adding any missing wanted files to the set of
files to extract to properly report and count them.

Merge pull request #6 from zao/pr/find-hash-seed

Derive seed for MurmurHash64A automatically

Merge pull request #5 from zao/pr/fix-3.21.2-hashes

Add support for 3.21.2 path hashes

Merge pull request #3 from zao/arm64_noalias

Use SIMDe intrinsics over native names