feat: implement and calculate the current key period using pallas #126

Job	Run time
build-docusaurus	1m 52s
build-test-wasm	2m 21s
build (macos-12)	2m 6s
build-open-api-ui	6s
build (windows-latest)	3m 38s
build-ubuntu-X64	3m 29s
cargo-doc	43s
check	1m 4s
test (ubuntu-22.04)	9m 39s
test (macos-12)	2m 36s
test (windows-latest)	5m 59s
publish-wasm-test (mithril-client-wasm)	53s
build-test-explorer	41s
publish-docs	0s
e2e (std, thales, 8.7.3, 0, #1)	1m 7s
e2e (std, thales, 8.7.3, 0, #2)	1m 7s
e2e (std, thales, 8.7.3, 10, #1)	1m 6s
e2e (std, thales, 8.7.3, 10, #2)	1m 9s
e2e (std, thales, 8.7.3, 100, #1)	1m 11s
e2e (std, thales, 8.7.3, 100, #2)	1m 10s
e2e (std, thales, 8.1.2, 100, #1)	1m 17s
e2e (p2p, thales, 8.7.3, 100, #1, --use-p2p-network)	1m 20s
send-tests-results	18s
publish-crate-test	0s
docker-mithril	0s
unstable-release	0s
deploy-testing	0s
	44m 52s

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