Support XXH and other performant hash algorithms

Today we support hashing sources as well as files within sources, which is all configurable:

```yaml
# .syft.yaml

file:
metadata:
# the file digest algorithms to use when cataloging files (options: "md5", "sha1", "sha224", "sha256", "sha384", "sha512") (env: SYFT_FILE_METADATA_DIGESTS)
digests:
- 'sha1'
- 'sha256'

source:
file:
# the file digest algorithms to use on the scanned file (options: "md5", "sha1", "sha224", "sha256", "sha384", "sha512") (env: SYFT_SOURCE_FILE_DIGESTS)
digests:
- 'SHA-256'
```

We should add more performant algorithms such as XXH64 (insert more here, open to suggestions!).

Start by tracing the file.metadata.digests and source.file.digests configuration, including SYFT_FILE_METADATA_DIGESTS and SYFT_SOURCE_FILE_DIGESTS, to find their validation and hashing entry points. Determine which performant algorithms are in scope and how they should be exposed; done means both source and file hashing accept the agreed algorithms without breaking existing options, with corresponding tests.

Written by the indexing model from the issue text.