feat: implement and calculate the current key period using pallas #5667

Job	Run time
build-open-api-ui	7s
build-test-wasm	1m 49s
build (macos-12)	2m 45s
build-docusaurus	1m 57s
build (windows-latest)	4m 5s
cargo-doc	49s
build-ubuntu-X64	3m 33s
check	1m 12s
test (ubuntu-22.04)	5m 48s
test (macos-12)	1m 59s
test (windows-latest)	5m 1s
publish-wasm-test (mithril-client-wasm)	1m 7s
build-test-explorer	49s
publish-docs	0s
e2e (std, thales, 8.7.3, 0, #1)	1m 6s
e2e (std, thales, 8.7.3, 0, #2)	1m 31s
e2e (std, thales, 8.7.3, 10, #1)	1m 11s
e2e (std, thales, 8.7.3, 10, #2)	1m 14s
e2e (std, thales, 8.7.3, 100, #1)	1m 7s
e2e (std, thales, 8.7.3, 100, #2)	1m 7s
e2e (std, thales, 8.1.2, 100, #1)	1m 16s
e2e (p2p, thales, 8.7.3, 100, #1, --use-p2p-network)	1m 15s
send-tests-results	10s
docker-mithril (mithril-aggregator)	29s
publish-crate-test (mithril-stm)	10s
docker-mithril (mithril-client-cli)	15s
publish-crate-test (mithril-build-script)	5s
docker-mithril (mithril-signer)	22s
unstable-release	0s
publish-crate-test (mithril-common)	6s
docker-mithril (mithril-relay)	19s
publish-crate-test (mithril-client)	5s
deploy-testing	0s
	42m 49s

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