test(serde): add unit tests for serde storage #5099

Job	Run time
doctest	2m 19s
test ubuntu-latest stable --no-default-features	1m 56s
clippy	1m 0s
check no_std	17s
docs	59s
test ubuntu-latest stable	2m 0s
test ubuntu-latest stable --all-features	2m 49s
feature-checks	6m 36s
fmt	15s
wasm-unknown	1m 3s
test ubuntu-latest nightly --no-default-features	1m 13s
test ubuntu-latest nightly	1m 35s
wasm-wasi	1m 19s
test ubuntu-latest nightly --all-features	2m 15s
test ubuntu-latest 1.79 --no-default-features	1m 10s
test ubuntu-latest 1.79	1m 10s
test windows-latest stable --no-default-features	4m 27s
test windows-latest stable	5m 1s
test windows-latest stable --all-features	5m 20s
test windows-latest nightly --no-default-features	4m 15s
test windows-latest nightly	4m 21s
test windows-latest nightly --all-features	5m 44s
test windows-latest 1.79 --no-default-features	2m 39s
test windows-latest 1.79	3m 34s
ci success	4s
	1h 3m 21s

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