Add copy operator to internal/stanza used by filelogreceiver (#4188)

Author: pmalek

internal/stanza/register.go

@@ -21,6 +21,7 @@ import (
 	_ "github.com/open-telemetry/opentelemetry-log-collection/operator/builtin/parser/severity"
 	_ "github.com/open-telemetry/opentelemetry-log-collection/operator/builtin/parser/time"
 	_ "github.com/open-telemetry/opentelemetry-log-collection/operator/builtin/parser/trace"
+	_ "github.com/open-telemetry/opentelemetry-log-collection/operator/builtin/transformer/copy"
 	_ "github.com/open-telemetry/opentelemetry-log-collection/operator/builtin/transformer/metadata"
 	_ "github.com/open-telemetry/opentelemetry-log-collection/operator/builtin/transformer/recombine"
 	_ "github.com/open-telemetry/opentelemetry-log-collection/operator/builtin/transformer/restructure"