refactor!: use same paths representation for unix/windows

[aawsome]

Use typed_path to use a common unix path representation on both windows/unix. This will increase windows compatibility and makes testing easier.

[codecov]

Codecov Report

Attention: Patch coverage is 44.01914% with 117 lines in your changes missing coverage. Please review.

Project coverage is 43.4%. Comparing base (213665e) to head (e424290).

Files with missing lines	Patch %	Lines
crates/core/src/backend/local_destination.rs	0.0%	24 Missing ⚠️
crates/core/src/util.rs	35.1%	24 Missing ⚠️
crates/core/src/commands/backup.rs	33.3%	18 Missing ⚠️
crates/core/src/blob/tree.rs	46.1%	14 Missing ⚠️
crates/core/src/commands/restore.rs	0.0%	14 Missing ⚠️
crates/core/src/vfs.rs	42.8%	12 Missing ⚠️
crates/core/src/repofile/snapshotfile.rs	0.0%	3 Missing ⚠️
crates/core/src/backend/ignore.rs	80.0%	2 Missing ⚠️
crates/core/src/archiver/tree.rs	93.3%	1 Missing ⚠️
crates/core/src/backend.rs	66.6%	1 Missing ⚠️
... and 4 more

Additional details and impacted files

Files with missing lines	Coverage Δ
crates/core/src/archiver.rs	61.3% <100.0%> (+1.5%)	⬆️
crates/core/src/archiver/parent.rs	68.0% <100.0%> (+1.3%)	⬆️
crates/core/src/archiver/tree_archiver.rs	68.4% <100.0%> (ø)
crates/core/src/backend/childstdout.rs	75.0% <100.0%> (ø)
crates/core/src/backend/node.rs	58.9% <100.0%> (-3.1%)	⬇️
crates/core/src/repository/command_input.rs	64.0% <ø> (+2.7%)	⬆️
crates/core/tests/integration.rs	85.7% <100.0%> (+0.5%)	⬆️
crates/core/src/archiver/tree.rs	70.9% <93.3%> (+13.3%)	⬆️
crates/core/src/backend.rs	55.5% <66.6%> (ø)
crates/core/src/backend/stdin.rs	0.0% <0.0%> (ø)
... and 11 more

... and 14 files with indirect coverage changes

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[aawsome]

I manually rebased to newest main.
@simonsan Can you please have a look at this PR? I think that a test on Windows is very much necessary here, but I don't own a windows system...