IoT messaging payload update

[Elsie4ever]

Add file path input for iot messaging and add non-decodable content handler for event monitoring

This pr is to address the 3 github issues below:

• Support d2c binary data input [bug] az iot device send-d2c-message doesn't allow for different data formats, only utf-8 #647
• Support sending binary data with c2d-message send How to send binary data with "az iot device c2d-message"? #287
• monitor-events hangs when it encountered non-unicode decodable message payload az iot hub monitor-events hangs when binary data (non json) azure-cli-extensions#4966

pipeline run: https://dev.azure.com/azureiotdevxp/aziotcli/_build/results?buildId=8186&view=results

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[digimaun]

Review chunk.

[digimaun]

Here is issue link for 3rd item in PR description Azure/azure-cli-extensions#4966

[Elsie4ever]

Have ran serveral time after the test fix and verified the test stopped failing https://dev.azure.com/azureiotdevxp/aziotcli/_build/results?buildId=8230&view=results