add Name method to ReceiveChannel and SendChannel interface

[bentveljanzx]

What was changed

• Added Name method to SendChannel and ReceiveChannel interface
• Added tests to assert Namereturns back the same given name.

Why?

• We have custom wrappers around signalling receive and send calls so that we can attach OpenTelemetry to our signal payload. Since we want our spans to contain the signal name and happen before calling into the underlying channel.Send method, ideally we could simplify our API to not require a redundant sending of the channelName again.
  • ie. telemetrytemporal.ChannelSend[T](ctx workflow.Context, channel workflow.SendChannel, channelName string, payload T)

Checklist

Closes #1304

2. How was this tested:

   • Added "TestChannelName" in internal/internal_coroutines_test.go which creates named channels and asserts that the Name method returns back the same name you gave it.

3. Any docs updates needed?

   • N/A

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[Quinn-With-Two-Ns]

Overall LGTM, just a couple of documentation points.