Tests

chore: remove alloydb example as the crate is not published #3377

Job	Run time
check std	21s
check serde	27s
check no-default-features	17s
clippy	1m 31s
docs	1m 26s
fmt	19s
test no_std	32s
test stable --no-default-features	1m 14s
test stable	1m 30s
test stable --all-features	1m 33s
test beta --no-default-features	1m 7s
test beta	1m 10s
test beta --all-features	1m 35s
test nightly --no-default-features	1m 1s
test nightly	1m 7s
test nightly --all-features	1m 26s
	16m 36s

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