Rust

Add `alerts` extension option #1183

Job	Run time
build_lib_test (nightly)	54s
build_wasm (nightly)	46s
build_lib_test (beta)	1m 4s
build_bin_spec (nightly)	59s
build_wasm (beta)	46s
build_lib_test (stable)	58s
clippy_format	2m 17s
build_bin_spec (beta)	1m 3s
build_lib_test ($MSRV)	2m 53s
build_wasm (stable)	48s
build_bin_spec (stable)	56s
build_wasm ($MSRV)	2m 27s
build_bin_spec ($MSRV)	2m 40s
lockfile	1m 0s
no_features_build_test (nightly)	27s
no_features_build_test (beta)	27s
no_features_build_test (stable)	24s
no_features_build_test ($MSRV)	1m 58s
	22m 47s

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