message: Introduce method to simplify creation of ideal emulated network
  Cr-Commit-Position: refs/heads/main@{#37588}
diff: @@ -197,6 +197,11 @@ class NetworkEmulationManager {
  // Returns a mode in which underlying time controller operates.
  virtual TimeMode time_mode() const = 0;
  + // Creates an emulated network node, which represents ideal network with
  + // unlimited capacity, no delay and no packet loss.
  + EmulatedNetworkNode* CreateUnconstrainedEmulatedNode() {
  + return CreateEmulatedNode(BuiltInNetworkBehaviorConfig());
  + }
  // Creates an emulated network node, which represents single network in
  // the emulated network layer. Uses default implementation on network behavior
  // which can be configured with `config`. `random_seed` can be provided to
  