Introduce `#[builder(derive(Into))]` attribute #833

Job	Run time
version-sync	4s
cargo-lock	5s
test-msrv (ubuntu)	1m 39s
runtime-benchmarks (args_3)	1m 11s
test-msrv (windows)	2m 1s
compilation-benchmarks	2m 1s
runtime-benchmarks (args_5)	59s
test-msrv (macos)	1m 29s
test-stable (ubuntu)	1m 19s
runtime-benchmarks (args_10_alloc)	1m 23s
test-stable (windows)	4m 7s
runtime-benchmarks (args_10_structs)	56s
test-unstable (beta)	26s
test-stable (macos)	1m 17s
runtime-benchmarks (args_10)	51s
test-unstable (nightly)	25s
runtime-benchmarks (args_20)	56s
cargo-doc (ubuntu)	20s
cargo-fmt	17s
cargo-doc (windows)	1m 44s
cargo-machete	3s
cargo-doc (macos)	31s
cargo-miri	1m 52s
prettier	9s
taplo-fmt	4s
typos	4s
website-build	28s
	26m 41s

Provide feedback