feat: implement and calculate the current key period using pallas #5578

Job	Run time
build-test-wasm	2m 37s
build-docusaurus	2m 12s
build (macos-12)	15m 29s
build-open-api-ui	7s
build (windows-latest)	13m 47s
build-ubuntu-X64	12m 20s
cargo-doc	4m 49s
test (ubuntu-22.04)	10m 36s
check	5m 21s
test (macos-12)	17m 17s
test (windows-latest)	7m 41s
build-test-explorer	46s
publish-wasm-test (mithril-client-wasm)	1m 45s
publish-docs	0s
e2e (std, thales, 8.7.3, 0, #1)	1m 10s
e2e (std, thales, 8.7.3, 0, #2)	1m 7s
e2e (std, thales, 8.7.3, 10, #1)	1m 17s
e2e (std, thales, 8.7.3, 10, #2)	1m 10s
e2e (std, thales, 8.7.3, 100, #1)	1m 13s
e2e (std, thales, 8.7.3, 100, #2)	1m 9s
e2e (std, thales, 8.1.2, 100, #1)	1m 8s
e2e (p2p, thales, 8.7.3, 100, #1, --use-p2p-network)	1m 14s
send-tests-results	10s
publish-crate-test	0s
unstable-release	0s
docker-mithril	0s
deploy-testing	0s
	1h 44m 25s

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