Avoid exposing internal implementation public in OC/OTEL receivers

Signed-off-by: Bogdan Drutu <bogdandrutu@gmail.com>

Author: bogdandrutu

.golangci.yml

@@ -119,7 +119,7 @@ issues:
       linters:
         # See https://github.com/golangci/golangci-lint/issues/537#issuecomment-545170007
         - structcheck
-    - path: receiver/otlpreceiver/marshal_jsonpb\.go
+    - path: receiver/otlpreceiver/internal/marshal_jsonpb\.go
       linters:
         - gocritic
         - gosimple

…iver/opencensusreceiver/ocmetrics/doc.go …censusreceiver/internal/ocmetrics/doc.goreceiver/opencensusreceiver/ocmetrics/doc.go renamed to receiver/opencensusreceiver/internal/ocmetrics/doc.go receiver/opencensusreceiver/ocmetrics/doc.go renamed to receiver/opencensusreceiver/internal/ocmetrics/doc.go

@@ -33,8 +33,8 @@ import (
 	"go.opentelemetry.io/collector/config"
 	"go.opentelemetry.io/collector/config/configgrpc"
 	"go.opentelemetry.io/collector/consumer"
-	"go.opentelemetry.io/collector/receiver/opencensusreceiver/ocmetrics"
-	"go.opentelemetry.io/collector/receiver/opencensusreceiver/octrace"
+	"go.opentelemetry.io/collector/receiver/opencensusreceiver/internal/ocmetrics"
+	"go.opentelemetry.io/collector/receiver/opencensusreceiver/internal/octrace"
 )
 
 // ocReceiver is the type that exposes Trace and Metrics reception.