feat(client): `TrySendError<T>` is `From<Error>` #3002

Job	Run time
Verify hyper.h is up to date	32s
Check Style	7s
semver	15s
Check MSRV	1m 14s
features	27s
Test beta on ubuntu-latest	1m 14s
Test stable on windows-latest	3m 34s
Test stable on macOS-latest	1m 4s
Test beta on windows-latest	2m 11s
Test C API (FFI)	19s
Test nightly on ubuntu-latest	1m 9s
Test stable on ubuntu-latest	1m 18s
Test cargo-c support (FFI)	25s
Test nightly on windows-latest	2m 43s
Test nightly on macOS-latest	1m 40s
udeps	21s
Test beta on macOS-latest	1m 20s
minimal-versions	30s
Test with Miri	2m 39s
Build docs	19s
Check exposed types	16s
CI is green	2s
	23m 39s

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