Initialize versions within parsing and writing classes

Summary: This diff has no real functional change, we're just initializing the versions in the writers, parsers, codec, etc. based on the version that was negotiated during the handshake.

Reviewed By: afrind

Differential Revision: D70864940

fbshipit-source-id: 024c8dee2eaa78b61e280d0d70f9702ef36ea1e4

Author: Aman Sharma

proxygen/lib/http/webtransport/test/FakeSharedWebTransport.h

@@ -266,13 +266,19 @@ class FakeSharedWebTransport : public WebTransport {
     }
     readHandles.clear();
     peerHandler_->onSessionEnd(error);
+    sessionClosed_ = true;
     return folly::unit;
   }
 
+  bool isSessionClosed() const {
+    return sessionClosed_;
+  }
+
   std::map<uint64_t, std::shared_ptr<FakeStreamHandle>> writeHandles;
   std::map<uint64_t, std::shared_ptr<FakeStreamHandle>> readHandles;
 
  private:
+  bool sessionClosed_{false};
   uint64_t nextBidiStreamId_{0};
   uint64_t nextUniStreamId_{2};
   FakeSharedWebTransport* peer_{nullptr};