Explore gix APIs, experiment with gix-blame API #5316

Job	Run time
test	11m 17s
pure-rust-build	1m 57s
test-fast (windows-latest)	17m 6s
test-fast (macos-latest)	4m 2s
cargo-deny	30s
test-fast (ubuntu-latest)	4m 17s
cargo-deny-advisories	26s
lint	3m 46s
test-32bit	7m 46s
test-32bit-cross (armv7-linux-androideabi)	1m 8s
test-fixtures-windows	15m 51s
test-journey	4m 11s
check-blocking	6s
check-packetline (ubuntu-latest)	5s
WebAssembly (wasm32-unknown-unknown)	1m 9s
WebAssembly (wasm32-wasi)	49s
Tests pass	1s
	1h 14m 27s

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