fix: use NewClientWithPort() to create the dapr client instead of NewClient().

[tpiperatgod]

We perform client.Close() to close all connections when the dapr client has an exception to interact with the target service.

I have elevated this dapr client to the functionframeworks pkg, which makes it a global variable that can be reused and will only be recreated if the function throws an exception.

In addition, the dapr client created with NewClient() will remain in the the client connection is closing state, even if the target service is restored.

== APP == 2021/12/28 14:47:57 binding - Data: Received
== APP == dapr client initializing for: 127.0.0.1:42327
== APP == 2021/12/28 14:47:59 binding - Data: Received
== APP == 2021/12/28 14:48:01 binding - Data: Received
== APP == 2021/12/28 14:48:03 binding - Data: Received
== APP == 2021/12/28 14:48:03 Error: error invoking binding echo/create: rpc error: code = Internal desc = error when invoke output binding echo: Post "http://localhost:7489/echo": dial tcp 127.0.0.1:7489: connect: connection refused
== APP == 2021/12/28 14:48:05 binding - Data: Received
== APP == 2021/12/28 14:48:05 Error: error invoking binding echo/create: rpc error: code = Canceled desc = grpc: the client connection is closing
== APP == 2021/12/28 14:48:07 binding - Data: Received
== APP == 2021/12/28 14:48:07 Error: error invoking binding echo/create: rpc error: code = Canceled desc = grpc: the client connection is closing
== APP == 2021/12/28 14:48:09 binding - Data: Received
== APP == 2021/12/28 14:48:09 Error: error invoking binding echo/create: rpc error: code = Canceled desc = grpc: the client connection is closing

Instead, the dapr client created with NewClientWithPort() will be restored as the peer service is restored.

== APP == 2021/12/28 16:55:19 binding - Data: Received
== APP == 2021/12/28 16:55:19 Error: error invoking binding echo/create: rpc error: code = Internal desc = error when invoke output binding echo: Post "http://localhost:7489/echo": dial tcp 127.0.0.1:7489: connect: connection refused
== APP == 2021/12/28 16:55:21 binding - Data: Received
== APP == 2021/12/28 16:55:21 Error: error invoking binding echo/create: rpc error: code = Internal desc = error when invoke output binding echo: Post "http://localhost:7489/echo": dial tcp 127.0.0.1:7489: connect: connection refused
== APP == 2021/12/28 16:55:23 binding - Data: Received
== APP == 2021/12/28 16:55:23 Error: error invoking binding echo/create: rpc error: code = Internal desc = error when invoke output binding echo: Post "http://localhost:7489/echo": dial tcp 127.0.0.1:7489: connect: connection refused
== APP == 2021/12/28 16:55:25 binding - Data: Received
== APP == 2021/12/28 16:55:27 binding - Data: Received
== APP == 2021/12/28 16:55:29 binding - Data: Received
== APP == 2021/12/28 16:55:31 binding - Data: Received
== APP == 2021/12/28 16:55:31 Error: error invoking binding echo/create: rpc error: code = Internal desc = error when invoke output binding echo: Post "http://localhost:7489/echo": dial tcp 127.0.0.1:7489: connect: connection refused
== APP == 2021/12/28 16:55:33 binding - Data: Received
== APP == 2021/12/28 16:55:33 Error: error invoking binding echo/create: rpc error: code = Internal desc = error when invoke output binding echo: Post "http://localhost:7489/echo": dial tcp 127.0.0.1:7489: connect: connection refused
== APP == 2021/12/28 16:55:35 binding - Data: Received
== APP == 2021/12/28 16:55:35 Error: error invoking binding echo/create: rpc error: code = Internal desc = error when invoke output binding echo: Post "http://localhost:7489/echo": dial tcp 127.0.0.1:7489: connect: connection refused
== APP == 2021/12/28 16:55:37 binding - Data: Received
== APP == 2021/12/28 16:55:37 Error: error invoking binding echo/create: rpc error: code = Internal desc = error when invoke output binding echo: Post "http://localhost:7489/echo": dial tcp 127.0.0.1:7489: connect: connection refused

Signed-off-by: laminar fangtian@kubesphere.io