replace receive slot with event stream (#13563)

* WIP

* event stream wip

* returning nil

* temp removing some tests

* wip health checks

* fixing conficts

* updating fields based on linting

* fixing more errors

* fixing mocks

* fixing more mocks

* fixing more linting

* removing white space for lint

* fixing log format

* gaz

* reverting changes on grpc

* fixing unit tests

* adding in tests for health tracker and event stream

* adding more tests for streaming slot

* gaz

* Update api/client/event/event_stream.go

Co-authored-by: Radosław Kapka <rkapka@wp.pl>

* review comments

* Update validator/client/runner.go

Co-authored-by: Radosław Kapka <rkapka@wp.pl>

* Update validator/client/validator.go

Co-authored-by: Radosław Kapka <rkapka@wp.pl>

* Update validator/client/validator.go

Co-authored-by: Radosław Kapka <rkapka@wp.pl>

* Update validator/client/validator.go

Co-authored-by: Radosław Kapka <rkapka@wp.pl>

* Update validator/client/validator.go

Co-authored-by: Radosław Kapka <rkapka@wp.pl>

* Update validator/client/beacon-api/beacon_api_validator_client.go

Co-authored-by: Radosław Kapka <rkapka@wp.pl>

* Update validator/client/validator.go

Co-authored-by: Radosław Kapka <rkapka@wp.pl>

* Update validator/client/validator.go

Co-authored-by: Radosław Kapka <rkapka@wp.pl>

* addressing radek comments

* Update validator/client/validator.go

Co-authored-by: Radosław Kapka <rkapka@wp.pl>

* addressing review feedback

* moving things to below next slot ticker

* fixing tests

* update naming

* adding TODO comment

* Update api/client/beacon/health.go

Co-authored-by: Radosław Kapka <rkapka@wp.pl>

* addressing comments

* fixing broken linting

* fixing more import issues

* fixing more import issues

* linting

* updating based on radek's comments

* addressing more comments

* fixing nogo error

* fixing duplicate import

* gaz

* adding radek's review suggestion

* Update proto/prysm/v1alpha1/node.proto

Co-authored-by: Preston Van Loon <pvanloon@offchainlabs.com>

* preston review comments

* Update api/client/event/event_stream.go

Co-authored-by: Preston Van Loon <pvanloon@offchainlabs.com>

* Update validator/client/validator.go

Co-authored-by: Preston Van Loon <pvanloon@offchainlabs.com>

* addressing some more preston review items

* fixing tests for linting

* fixing missed linting

* updating based on feedback to simplify

* adding interface check at the top

* reverting some comments

* cleaning up intatiations

* reworking the health tracker

* fixing linting

* fixing more linting to adhear to interface

* adding interface check at the the top of the file

* fixing unit tests

* attempting to fix dependency cycle

* addressing radek's comment

* Update validator/client/beacon-api/beacon_api_validator_client.go

Co-authored-by: Preston Van Loon <pvanloon@offchainlabs.com>

* adding more tests and feedback items

* fixing TODO comment

---------

Co-authored-by: Radosław Kapka <rkapka@wp.pl>
Co-authored-by: Preston Van Loon <pvanloon@offchainlabs.com>

validator/rpc/beacon.go

@@ -54,10 +54,8 @@ func (s *Server) registerBeaconClient() error {
 		s.beaconApiTimeout,
 	)
 
-	restHandler := &beaconApi.BeaconApiJsonRestHandler{
-		HttpClient: http.Client{Timeout: s.beaconApiTimeout},
-		Host:       s.beaconApiEndpoint,
-	}
+	restHandler := beaconApi.NewBeaconApiJsonRestHandler(http.Client{Timeout: s.beaconApiTimeout}, s.beaconApiEndpoint)
+
 	s.beaconChainClient = beaconChainClientFactory.NewBeaconChainClient(conn, restHandler)
 	s.beaconNodeClient = nodeClientFactory.NewNodeClient(conn, restHandler)
 	s.beaconNodeValidatorClient = validatorClientFactory.NewValidatorClient(conn, restHandler)