imp(ibc-testkit): Tendermint proof verifications via integration test #2543

Job	Run time
Check features	0s
cleanup-runs	4s
clippy_all_features	1m 4s
clippy_no_default_features	49s
doc_all_features	1m 28s
nightly_fmt	14s
doc_no_default_features	1m 17s
test-msrv (ubuntu-latest, unknown-linux-gnu)	3m 12s
test-msrv (macos-latest, apple-darwin)	6m 23s
test-stable	2m 7s
	16m 38s

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