feat!: improve restore algorithm

[aawsome]

Enhances the blob-reading optimization used in the restore to also read small holes, like in #448.
In order to re-use the algorithm, a refactoring about blob locations has been done, making this PR a breaking change.

[codecov]

Codecov Report

❌ Patch coverage is 50.54945% with 45 lines in your changes missing coverage. Please review.
✅ Project coverage is 42.8%. Comparing base (6286476) to head (07320a9).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/core/src/commands/restore.rs	0.0%	28 Missing ⚠️
crates/core/src/blob.rs	61.1%	7 Missing ⚠️
crates/core/src/commands/prune.rs	54.5%	5 Missing ⚠️
crates/core/src/blob/packer.rs	80.0%	3 Missing ⚠️
crates/core/src/commands/repoinfo.rs	0.0%	1 Missing ⚠️
crates/core/src/index.rs	50.0%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
crates/core/src/backend/decrypt.rs	48.9% <100.0%> (+0.5%)	⬆️
crates/core/src/commands/check.rs	64.2% <100.0%> (+0.6%)	⬆️
crates/core/src/index/binarysorted.rs	86.7% <100.0%> (-0.6%)	⬇️
crates/core/src/repofile/indexfile.rs	92.3% <ø> (-7.7%)	⬇️
crates/core/src/repofile/packfile.rs	75.0% <100.0%> (+5.0%)	⬆️
crates/core/src/commands/repoinfo.rs	0.0% <0.0%> (ø)
crates/core/src/index.rs	54.0% <50.0%> (-6.0%)	⬇️
crates/core/src/blob/packer.rs	49.0% <80.0%> (+0.1%)	⬆️
crates/core/src/commands/prune.rs	65.3% <54.5%> (-1.5%)	⬇️
crates/core/src/blob.rs	67.8% <61.1%> (-12.2%)	⬇️
... and 1 more

... and 17 files with indirect coverage changes

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