feat: simple delta and customized delta relationship #7955

Job	Run time
test	12m 18s
test-32bit (arm32v7)	4m 26s
test-32bit (i386)	6m 18s
test-32bit-windows-size-doc	9m 53s
test-doc	1m 36s
test-journey	3m 55s
cargo check MSRV (ubuntu-latest)	1m 31s
test-fixtures-windows (windows-latest)	14m 47s
pure-rust-build	2m 11s
test-fixtures-windows (windows-11-arm)	17m 22s
cargo check MSRV (windows-2025)	2m 56s
check-blocking	8s
cargo-deny	30s
lint	4m 47s
test-fast (windows-latest)	8m 56s
test-fast (ubuntu-latest)	2m 38s
check-no-persist-credentials	6s
cargo-deny-advisories	28s
test-fast (windows-11-arm)	13m 1s
Check MSRV badge	10s
test-fast (ubuntu-24.04-arm)	2m 47s
WebAssembly (wasm32-wasip2)	1m 4s
test-fast (macos-latest)	3m 56s
WebAssembly (wasm32-unknown-unknown)	55s
WebAssembly (wasm32-wasip1)	1m 4s
Tests pass	4s
	1h 57m 47s

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