feat!: extend LocalSourceSaveOptions

[aawsome]

This refacors LocalSourceSaveOptions and introduces changed/new options:

• with-atime => set-atime allows yes, no, mtime (default)
• set-ctime allows yes, no, mtime (default)
• with-devid => set-devid allows yes, no, hardlink (default)
• set-blockdev allows special (default), file - which allows reading block devices; closes If I want a backup block device (bytes array), can it support it? #104
• set-xattrs allows yes, no; closes [Feature Request] Avoid trying to backup xattrs rustic#1599

Additional, the parent-processing algorithm has been updated. Now ctime and inode are only compared if they are set either in the parent or in the current snapshot.

[codecov]

Codecov Report

❌ Patch coverage is 51.40187% with 52 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.2%. Comparing base (acc90e9) to head (12def46).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
...rates/core/src/backend/ignore/mapper/nix_mapper.rs	34.2%	25 Missing ⚠️
crates/core/src/backend/ignore/mapper.rs	60.7%	22 Missing ⚠️
crates/core/src/backend/ignore.rs	40.0%	3 Missing ⚠️
crates/core/src/archiver/parent.rs	75.0%	2 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
crates/core/src/backend/local_destination.rs	0.0% <ø> (ø)
crates/core/src/archiver/parent.rs	65.7% <75.0%> (-1.8%)	⬇️
crates/core/src/backend/ignore.rs	37.1% <40.0%> (-3.7%)	⬇️
crates/core/src/backend/ignore/mapper.rs	60.7% <60.7%> (ø)
...rates/core/src/backend/ignore/mapper/nix_mapper.rs	34.2% <34.2%> (ø)

... and 21 files with indirect coverage changes

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