* Update DB migration docs

* Document VC broadcast modes

* Update downgrade example (#6)

* update downgrade example

* Add period

* Add v4.1.0

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Co-authored-by: chonghe <44791194+chong-he@users.noreply.github.com>

* introduce availability pending block

* add intoavailableblock trait

* small fixes

* add 'gossip blob cache' and start to clean up processing and transition types

* shard memory blob cache

* Initial commit

* Fix after rebase

* Add gossip verification conditions

* cache cleanup

* general chaos

* extended chaos

* cargo fmt

* more progress

* more progress

* tons of changes, just tryna compile

* everything, everywhere, all at once

* Reprocess an ExecutedBlock on unavailable blobs

* Add sus gossip verification for blobs

* Merge stuff

* Remove reprocessing cache stuff

* lint

* Add a wrapper to allow construction of only valid `AvailableBlock`s

* rename blob arc list to blob list

* merge cleanuo

* Revert "merge cleanuo"

This reverts commit 5e98326.

* Revert "Revert "merge cleanuo""

This reverts commit 3a40094.

* fix rpc methods

* move beacon block and blob to eth2/types

* rename gossip blob cache to data availability checker

* lots of changes

* fix some compilation issues

* fix compilation issues

* fix compilation issues

* fix compilation issues

* fix compilation issues

* fix compilation issues

* cargo fmt

* use a common data structure for block import types

* fix availability check on proposal import

* refactor the blob cache and split the block wrapper into two types

* add type conversion for signed block and block wrapper

* fix beacon chain tests and do some renaming, add some comments

* Partial processing (#4)

* move beacon block and blob to eth2/types

* rename gossip blob cache to data availability checker

* lots of changes

* fix some compilation issues

* fix compilation issues

* fix compilation issues

* fix compilation issues

* fix compilation issues

* fix compilation issues

* cargo fmt

* use a common data structure for block import types

* fix availability check on proposal import

* refactor the blob cache and split the block wrapper into two types

* add type conversion for signed block and block wrapper

* fix beacon chain tests and do some renaming, add some comments

* cargo update (#6)

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Co-authored-by: realbigsean <sean@sigmaprime.io>
Co-authored-by: realbigsean <seananderson33@gmail.com>