Explore gix APIs, experiment with gix-blame API #4767

Job	Run time
pure-rust-build	2m 6s
test	14m 23s
test-fast (windows-latest)	2m 54s
test-fast (macos-latest)	2m 55s
cargo-deny (advisories)	30s
test-fast (ubuntu-latest)	3m 8s
cargo-deny (bans licenses sources)	31s
check-packetline (ubuntu-latest)	5s
test-32bit (armv7-linux-androideabi)	1m 12s
lint	3m 57s
WebAssembly (wasm32-unknown-unknown)	1m 10s
WebAssembly (wasm32-wasi)	42s
Tests pass	1s
	33m 34s

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