refactor: reconnect even if we failed to start transport

[deleteLater]

We should try to reconnect even we failed to start initially.

fixed #11

Example running log

info: FeatBit.Sdk.Server.FbClient[0]
      Starting FbClient...
info: FeatBit.Sdk.Server.FbClient[0]
      Waiting up to 3000 milliseconds for FbClient to start...
fail: FeatBit.Sdk.Server.FbClient[0]
      FbClient failed to start successfully within 3000 milliseconds. This error usually indicates a connection issue with FeatBit or an invalid secret. Please double-check your EnvSecret and StreamingUri configuration.
warn: FeatBit.Sdk.Server.Transport.FbWebSocket[16]
      FbWebSocket is trying to reconnect. Flag evaluation results may be stale until reconnected.
info: FeatBit.Sdk.Server.Transport.FbWebSocket[18]
      Reconnect attempt number 0 will start in 00:00:00.
info: Microsoft.Hosting.Lifetime[14]
      Now listening on: http://localhost:5014
info: Microsoft.Hosting.Lifetime[0]
      Application started. Press Ctrl+C to shut down.
info: Microsoft.Hosting.Lifetime[0]
      Hosting environment: Development
info: Microsoft.Hosting.Lifetime[0]
      Content root path: D:\Work\featbit-sdks\dotnet-server-sdk\examples\WebApiApp\
info: FeatBit.Sdk.Server.Transport.FbWebSocket[18]
      Reconnect attempt number 1 will start in 00:00:01.
info: FeatBit.Sdk.Server.Transport.FbWebSocket[18]
      Reconnect attempt number 2 will start in 00:00:02.
info: FeatBit.Sdk.Server.Transport.FbWebSocket[18]
      Reconnect attempt number 3 will start in 00:00:03.
info: FeatBit.Sdk.Server.Transport.FbWebSocket[7]
      FbWebSocket started.
info: FeatBit.Sdk.Server.Transport.FbWebSocket[20]
      FbWebSocket reconnected successfully after 3 attempts and 00:00:19.6971031 elapsed.

[leachdaniel-clark]

I've built this branch locally and manually tested with a disabled network interface that it will connect and do the data sync once the network is fixed:

12:11:30 -> warn: FeatBit.Sdk.Server.Transport.FbWebSocket[16]
      FbWebSocket is trying to reconnect. Flag evaluation results may be stale until reconnected.
12:11:34 -> fail: FeatBit.Sdk.Server.FbClient[0]
      FbClient failed to start successfully within 5000 milliseconds. This error usually indicates a connection issue with FeatBit or an invalid secret. Please double-check your EnvSecret and StreamingUri configuration.
12:12:24 -> dbug: FeatBit.Sdk.Server.DataSynchronizer.WebSocketDataSynchronizer[0]
      Do data-sync with version: 0
12:12:25 -> dbug: FeatBit.Sdk.Server.DataSynchronizer.WebSocketDataSynchronizer[0]
      Received full data-sync message

[wss-rbrennan]

LGTM