Explore gix APIs, experiment with gix-blame API #4734

Job	Run time
check-packetline (ubuntu-latest)	7s
lint	1m 17s
cargo-deny (advisories)	28s
cargo-deny (bans licenses sources)	25s
test	18m 3s
pure-rust-build	1m 57s
test-32bit (armv7-linux-androideabi)	1m 15s
test-fast (windows-latest)	19m 35s
WebAssembly (wasm32-unknown-unknown)	1m 21s
test-fast (macos-latest)	4m 19s
WebAssembly (wasm32-wasi)	1m 20s
test-fast (ubuntu-latest)	6m 1s
Tests pass	1s
	56m 9s

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