Add `LocalChain::disconnect_from` method #4528

Job	Run time
Check WASM	48s
Check no_std	21s
Build and test (stable, true, --no-default-features)	2m 37s
Build and test (stable, true, --all-features)	2m 58s
clippy_check	26s
Rust fmt	8s
Build and test (1.63.0, --no-default-features)	4m 2s
Build and test (1.63.0, --all-features)	4m 19s
	15m 39s

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