Refactor LFS handling #2849

Job	Run time
cargo clippy (windows-latest)	4m 16s
cargo check (msrv) (windows-latest)	1m 13s
cargo clippy (macos-latest)	1m 49s
cargo check (aarch64-android)	24s
cargo check (msrv) (macos-latest)	30s
cargo check (msrv) (wasm32)	17s
cargo clippy (ubuntu-latest)	3m 5s
cargo check (msrv) (ubuntu-latest)	43s
cargo clippy (wasm32)	1m 50s
cargo doc	45s
formatting	35s
cargo miri (unsafe tree_arena)	36s
Prime LFS Cache	3s
cargo test (wasm32)	18s
typos	4s
cargo test (windows-latest)	3m 20s
cargo test (macos-latest)	1m 35s
cargo test (ubuntu-latest)	3m 19s
	24m 42s

Provide feedback