Add `gix blame --since` #5648

Job	Run time
cargo-deny	33s
cargo-deny-advisories	30s
check-blocking	5s
check-packetline (ubuntu-latest)	6s
lint	3m 55s
pure-rust-build	1m 55s
test	10m 24s
test-32bit (i386)	5m 30s
test-32bit (arm32v7)	5m 17s
test-fast (windows-latest)	1m 37s
test-fast (macos-latest)	2m 22s
test-fast (ubuntu-latest)	2m 41s
test-fixtures-windows	15m 43s
test-journey	4m 10s
test-fast (ubuntu-22.04-arm)	2m 15s
WebAssembly (wasm32-unknown-unknown)	1m 11s
WebAssembly (wasm32-wasip1)	41s
Tests pass	1s
	58m 56s

Provide feedback