feat: Add new rpc query function to check validators' liveness(uptime) (backport #3899) #1113

Job	Run time
lints	5m 42s
build-binaries	10m 13s
changelog	19s
check-packages	5m 6s
build-wasm (wasm, build-wasm-scripts, wasm/tx_.wasm wasm/vp_.wasm wasm/checksums.json )	3m 40s
build-wasm (wasm-for-tests, build-wasm-tests-scripts, wasm_for_tests/*.wasm)	3m 24s
rust-docs	6m 5s
test-wasm	7m 26s
check-benchmarks	10m 8s
test-integration	16m 23s
test-unit	10m 41s
test-e2e-with-device-automation	9m 23s
test-e2e (0)	22m 17s
test-e2e (1)	21m 2s
test-e2e (2)	22m 19s
test-e2e (3)	21m 52s
test-e2e (4)	18m 0s
upload-coverage	8s
	3h 14m 8s

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