fix: read index entries in dump before processing

[aawsome]

This removes the breaking change in the Repository method and allows further optimizations about how to read and cache blobs.

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 52.6%. Comparing base (d8abf46) to head (52b6d3d).

Files with missing lines	Patch %	Lines
crates/core/src/commands/dump.rs	55.5%	4 Missing ⚠️
crates/core/src/repository.rs	0.0%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
crates/core/src/repository.rs	62.2% <0.0%> (+0.1%)	⬆️
crates/core/src/commands/dump.rs	57.1% <55.5%> (+0.6%)	⬆️

... and 9 files with indirect coverage changes

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