* refactor chain service
* restructure service and lint
* all calls to receive block in chain service are now blocking
* begin fixing tests
* refactored blockchain tests
* builds correctly
* blockchain tests pass again
* lint
* sync and rpc tests pass again
* done
* add in open tracing
* span in fork choice
* Update beacon-chain/blockchain/block_processing.go
Co-Authored-By: rauljordan <raul@prysmaticlabs.com>
