Store linear blocks in freezer db #152

Job	Run time
beacon-chain-tests	10m 35s
network-tests	17m 24s
op-pool-tests	20m 52s
target-branch-check	1s
release-tests-ubuntu	32m 42s
debug-tests-ubuntu	25m 38s
dockerfile-ubuntu	14m 10s
ef-tests-ubuntu	29m 7s
eth1-simulator-ubuntu	26m 3s
merge-transition-ubuntu	26m 20s
no-eth1-simulator-ubuntu	24m 10s
release-tests-windows	51m 31s
slasher-tests	5m 17s
state-transition-vectors-ubuntu	5m 26s
cargo-udeps	5m 50s
check-code	10m 23s
check-msrv	4m 25s
cli-check	18m 53s
compile-with-beta-compiler	13m 30s
doppelganger-protection-test	27m 41s
execution-engine-integration-ubuntu	16m 3s
syncing-simulator-ubuntu	18m 14s
test-suite-success	0s
	6h 44m 15s

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