feat: implement and calculate the current key period using pallas #117

Job	Run time
build-docusaurus	1m 57s
build-open-api-ui	15s
build-test-wasm	2m 5s
build (macos-12)	2m 29s
build (windows-latest)	2m 21s
build-ubuntu-X64	2m 32s
check	1m 7s
cargo-doc	42s
test (ubuntu-22.04)	2m 33s
test (macos-12)	1m 57s
test (windows-latest)	2m 20s
build-test-explorer	6s
publish-wasm-test (mithril-client-wasm)	7s
publish-docs	1s
e2e	1s
publish-tests-results	1s
publish-crate-test	1s
docker-mithril	1s
unstable-release	1s
deploy-testing	1s
	20m 38s

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