* add broadcaster impl
* change API so broadcast returns an error
* change API so broadcast returns an error
* add test for message not mapped
* lint msg
* lint msg
* checkpoint
* checkpoint
* varint prefix for ssz
* move the encoding API around a little bit to support reader writer
* add a simple test for the happy path subscribe
* move wait timeout to testutil
* Add inverted topic mapping
* Add varint prefixing to ssz network encoder
* fix spacing
* fix comments
* fix comments
* make anon methods more clear
* clean up log fields
* move topic mapping, reformat TODOs, get ready for brutal team review
* lint
* lint
* lint
* Update beacon-chain/p2p/gossip_topic_mappings.go
Co-Authored-By: Nishant Das <nishdas93@gmail.com>
* PR feedback
* PR feedback
* PR feedback
* PR feedback
* PR feedback
* basic test with a hardcoded fork choice
* updated beacon config to use genesis fork version
* checkpoint on hello handler
* create a testing db method that can be used with the new database interface
* lint
* lint
* PR feedback
* checkpoint
* passing tests
* comments, errors
* comments, errors
* remove swarm
* Update WORKSPACE
* Update WORKSPACE
* merge
* lint
* lint
* touch
* touch
* imports
