* Generate SSZ code for `BeaconBlockContainerV2`
* new line at end of file
* remove unneeded V2 suffix
* more fun stuff
# Conflicts:
# proto/eth/v1/generated.ssz.go
* rename Altair to V2
* Move proto services to a different package
# Conflicts:
# beacon-chain/rpc/service.go
* fix tests
* goimports
* fix java class name
* without aggregation_bits
* aggregation_bits
* v2 endpoints
* generate new code and define function stubs
* build files
Co-authored-by: Raul Jordan <raul@prysmaticlabs.com>