Remove contrib crates.

They have now been added in opentelemetry-rust-contrib

Relates open-telemetry#841

Author: hdost

Cargo.toml

@@ -1,9 +1,6 @@
 [workspace]
 members = [
     "opentelemetry",
-    "opentelemetry-aws",
-    "opentelemetry-contrib",
-    "opentelemetry-datadog",
     "opentelemetry-http",
     "opentelemetry-jaeger",
     "opentelemetry-jaeger/examples/actix-udp",
@@ -15,12 +12,8 @@ members = [
     "opentelemetry-proto",
     "opentelemetry-sdk",
     "opentelemetry-semantic-conventions",
-    "opentelemetry-stackdriver",
     "opentelemetry-stdout",
-    "opentelemetry-user-events-logs",
-    "opentelemetry-user-events-metrics",
     "opentelemetry-zipkin",
-    "opentelemetry-zpages",
     "opentelemetry-otlp/examples/basic-otlp",
     "opentelemetry-otlp/examples/basic-otlp-http",
     "opentelemetry-otlp/examples/external-otlp-grpcio-async-std",