feat: implement and calculate the current key period using pallas #111

Job	Run time
build-open-api-ui	9s
build-test-wasm	2m 39s
build-docusaurus	1m 53s
build (macos-12)	3m 27s
build-ubuntu-X64	4m 17s
build (windows-latest)	4m 16s
cargo-doc	1m 11s
check	1m 5s
test (ubuntu-22.04)	4m 30s
test (macos-12)	2m 33s
test (windows-latest)	4m 18s
publish-wasm-test (mithril-client-wasm)	1m 43s
build-test-explorer	45s
publish-docs	0s
e2e	1s
docker-mithril	1s
unstable-release	1s
publish-tests-results	1s
publish-crate-test	1s
deploy-testing	1s
	32m 52s

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