imp(ibc-client): rm `TryFrom<Error = ClientError>` restriction #98

Job	Run time
clippy_all_features	35s
Check features	18m 36s
clippy_no_default_features	31s
doc_all_features	1m 47s
doc_no_default_features	1m 43s
nightly_fmt	22s
test-msrv (ubuntu-latest, unknown-linux-gnu)	2m 29s
test-stable	1m 50s
test-msrv (macos-latest, apple-darwin)	2m 20s
	30m 13s

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