feat: Add Repository::drop_index and ::drop_data_from_index

[aawsome]

Adds the methods drop_index and drop_data_from_index to Repository. This can be handy to save memory if the index is no longer needed.

[codecov]

Codecov Report

Attention: Patch coverage is 19.35484% with 25 lines in your changes missing coverage. Please review.

Project coverage is 43.4%. Comparing base (3db5ace) to head (f65eaf2).

Files	Patch %	Lines
crates/core/src/repository.rs	25.0%	18 Missing ⚠️
crates/core/src/index/binarysorted.rs	0.0%	5 Missing ⚠️
crates/core/src/index.rs	0.0%	2 Missing ⚠️

Additional details and impacted files

Files	Coverage Δ
crates/core/tests/integration.rs	76.9% <ø> (ø)
crates/core/src/index.rs	52.0% <0.0%> (-5.7%)	⬇️
crates/core/src/index/binarysorted.rs	84.7% <0.0%> (-5.0%)	⬇️
crates/core/src/repository.rs	34.8% <25.0%> (-0.6%)	⬇️

... and 14 files with indirect coverage changes