feat(block): async epoch fetching #791

Job	Run time
Determine Image Tag	2s
proto / buf-check	8s
test / Go Mod Tidy Check	38s
test / Build All ev-node Binaries	1m 26s
test / Run Unit Tests	2m 51s
lint / goreleaser-check	9s
lint / golangci-lint	1m 29s
lint / hadolint	10s
test / Run Integration Tests	1m 38s
lint / markdown-lint	16s
lint / yamllint	10s
docker / Build ev-node-evm	17m 27s
docker / Build ev-node-testapp	15m 27s
test / Run EVM Execution Tests	2m 14s
test / Run E2E System Tests	10m 41s
test / Combine and Upload Coverage	9s
docker-tests / Docker Upgrade E2E Tests	3m 1s
docker-tests / Docker E2E Tests	6m 35s
	1h 4m 31s

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