add sample of module direct method in c sdk

[ChenCheng368]

From CSE code-with customer engagement, we observe that there is no sample of module direct method in Azure IoT C SDK from MS docs/repo, and there is only the sample for device direct method.

Thus we are writing this sample of Azure IoT Module Direct Method application usage.

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[ChenCheng368]

During code-with customer engegements, we witness that there is no existing module direct method sample in Azure iot C SDK in existing MS repo, only device direct method sample available.
I wrote the sample for module level to accelerate the development works. This pattern helps customer to clear C2D comms blockings, and also helps the other customer for deployment verification.

-- Chen Cheng from CSE IoT Tech Domain Solution Area

[veyalla]

Please contribute this sample to the C SDK repo: https://github.com/Azure/azure-iot-sdk-c/tree/main/iothub_client/samples