Impl serde::Serialize and serde::Deserialize for TimeDelta #3452

Job	Run time
features_check (ubuntu-latest)	4m 1s
no_std (ubuntu-latest, thumbv6m-none-eabi)	28s
no_std (ubuntu-latest, x86_64-fortanix-unknown-sgx)	38s
rust_msrv (ubuntu-latest)	48s
rust_versions (ubuntu-latest, stable)	55s
rust_versions (ubuntu-latest, beta)	1m 7s
timezones (ubuntu-latest, ACST-9:30)	1m 39s
rust_versions (ubuntu-latest, nightly)	55s
timezones (ubuntu-latest, EST4)	1m 23s
timezones (ubuntu-latest, UTC0)	1m 13s
timezones (ubuntu-latest, Asia/Katmandu)	1m 31s
timezones (macos-latest, ACST-9:30)	41s
alternative_targets (ubuntu-latest, wasm32-unknown-emscripten)	25s
timezones (macos-latest, EST4)	29s
alternative_targets (ubuntu-latest, aarch64-apple-ios)	15s
timezones (macos-latest, UTC0)	33s
alternative_targets (ubuntu-latest, aarch64-linux-android)	15s
timezones (macos-latest, Asia/Katmandu)	44s
timezones (windows-latest, ACST-9:30)	1m 18s
timezones (windows-latest, EST4)	3m 4s
cross-targets (x86_64-unknown-illumos)	1m 14s
check-docs	21s
timezones (windows-latest, UTC0)	2m 4s
timezones (windows-latest, Asia/Katmandu)	2m 37s
cross-tests (ubuntu-latest)	1m 34s
test_wasi (ubuntu-latest, wasm32-wasi)	1m 16s
test_wasm (ubuntu-latest)	32s
	32m 0s

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