feat(transport): retry layer #3005

Job	Run time
clippy	32s
cfg-check	35s
docs	1m 6s
doctest	1m 39s
feature-checks	3m 18s
fmt	12s
no-std	22s
wasm-unknown	1m 8s
wasm-wasi	1m 28s
test ubuntu-latest stable --no-default-features	1m 53s
test ubuntu-latest stable	1m 48s
test ubuntu-latest nightly --no-default-features	1m 23s
test ubuntu-latest nightly	1m 20s
test ubuntu-latest 1.76 --no-default-features	1m 5s
test ubuntu-latest 1.76	1m 25s
test windows-latest stable --no-default-features	5m 15s
test windows-latest stable	5m 33s
test windows-latest nightly --no-default-features	4m 58s
test windows-latest nightly	4m 44s
test windows-latest 1.76 --no-default-features	4m 8s
test windows-latest 1.76	3m 51s
	47m 43s

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