Move HHVM Thrift Server to ResourcePool API and Implement QueueTimeout

Summary:
* Moved code from old API to new API, so resourcePool migration for this AsyncProcessor considered DONE.
* Expose QueueTimeout from ThriftRequest, so downstream AsyncProcessor can implement own QueueTimeout instead of relying on thrift internal.
* Implemented queue timeout for HHVM thrift server.

Reviewed By: tlj77

Differential Revision: D64840522

fbshipit-source-id: 397ccb19c26c2de01705f463f28ff62f853e2573

thrift/lib/cpp2/async/ResponseChannel.h

@@ -158,6 +158,12 @@ class ResponseChannelRequest {
 
   virtual ~ResponseChannelRequest() = default;
 
+  // Get queue timeout for this request. So any owner who wants to enqueue this
+  // request before processing can schedule timeout.
+  virtual std::chrono::milliseconds getQueueTimeoutMs() const {
+    return std::chrono::milliseconds(0);
+  }
+
   bool getShouldStartProcessing() {
     if (!tryStartProcessing()) {
       return false;

thrift/lib/cpp2/transport/core/ThriftRequest.h

@@ -398,6 +398,10 @@ class ThriftRequestCore : public ResponseChannelRequest {
     }
   }
 
+  std::chrono::milliseconds getQueueTimeoutMs() const final {
+    return queueTimeout_.value;
+  }
+
   ResponseRpcMetadata makeResponseRpcMetadata(
       transport::THeader::StringToStringMap&& writeHeaders,
       std::optional<ProxiedPayloadMetadata> proxiedPayloadMetadata,