Migrate calls to Dapr's sidecar Actor APIS to GRPC

[artursouza]

Applications can use GRPC (in addition to HTTP) to make API calls for Actor.
This impacts Actor client and Actor runtime.
A property or environment variable can be used to switch between HTTP or GRPC communication.
GRPC communication is the default.

RELEASE NOTE: Support GRPC communication for Actor APIs into Dapr.

[artursouza]

Actor Client making HTTP calls: https://github.com/dapr/dotnet-sdk/blob/master/src/Dapr.Actors/Communication/Client/ActorNonRemotingClient.cs

Actor Proxy, using the HTTP client:

dotnet-sdk/src/Dapr.Actors/Client/ActorProxy.cs

Line 110 in fe1e697

public async Task<TResponse> InvokeMethodAsync<TRequest, TResponse>(string method, TRequest data, CancellationToken cancellationToken = default)

[berndverst]

@halspang please assign to @addjuarez. Priority P1, for upcoming v1.9 release. FYI @artursouza

This is related to dapr/dapr#5118

[addjuarez]

/assign

[adamreed90]

Curious of the status of this? :D