First approach on async #54

Job	Run time
build_docs	37s
no_features (ubuntu, 1.77)	22s
no_features (ubuntu, stable)	22s
with_features (ubuntu, 1.77, serde)	24s
no_features (ubuntu, beta)	25s
with_features (ubuntu, 1.77, send_guard)	23s
no_features (ubuntu, nightly)	20s
with_features (ubuntu, stable, serde)	1s
no_features (macos, 1.77)	21s
with_features (ubuntu, stable, send_guard)	1s
no_features (macos, stable)	26s
with_features (ubuntu, beta, serde)	25s
no_features (macos, beta)	24s
with_features (ubuntu, beta, send_guard)	21s
no_features (macos, nightly)	24s
with_features (ubuntu, nightly, serde)	25s
no_features (windows, 1.77)	20s
with_features (ubuntu, nightly, send_guard)	20s
no_features (windows, stable)	23s
with_features (macos, 1.77, serde)	1s
no_features (windows, beta)	21s
with_features (macos, 1.77, send_guard)	23s
with_features (macos, stable, serde)	1s
no_features (windows, nightly)	20s
with_features (macos, stable, send_guard)	1s
with_features (macos, beta, serde)	1s
with_features (macos, beta, send_guard)	1s
with_features (macos, nightly, serde)	1s
with_features (macos, nightly, send_guard)	1s
with_features (windows, 1.77, serde)	1s
with_features (windows, 1.77, send_guard)	1s
with_features (windows, stable, serde)	1s
with_features (windows, stable, send_guard)	1s
with_features (windows, beta, serde)	1s
with_features (windows, beta, send_guard)	1s
	8m 1s

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