* update ethereumapis deps
* V1AttToV1Alpha1 migration
* Implementation plus happy path test
* fix root variable names
* Invalid attestation test
* gzl
* mod tidy
* use a single append to concatenate two slices
* remove outdated comment from attestation processing
* invoke ProcessAttestationNoVerifySignature when validating attestations
* implement missing PoolMock members
* use new VerifyAttestationNoVerifySignature function
* Implement SubmitAttesterSlashing in the beacon API
* gzl
* remove migration test rule
* fix BUILD file formatting
Co-authored-by: Raul Jordan <raul@prysmaticlabs.com>
* pool interface and mock
* implementation
* gofmt
* gzl
* Use migration package for slashing mapping
Co-authored-by: Raul Jordan <raul@prysmaticlabs.com>