[Functions] Add support to create Flex Consumption function apps

[Francisco-Gamino]

Description

Add support to create Flex Consumption function apps

Issue script & Debug output

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Environment data

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Module versions

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Error output

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[Francisco-Gamino]

/cc @Anatolib @andystaples @nzthiago @kulkarnisonia16

[isra-fel]

I suppose this is a feature request that will be implemented by Functions team. Let me know if that's not the case.

[JustinGrote]

At a minimum:

• Support the api version to build the particular properties

Ideal:

• Hero Command or switch like -Type FlexConsumption that automates a lot of the steps
• A publish command to utilize the new Create and Publish actions https://github.com/Azure/azure-dev/issues/3658
• https://github.com/Azure/azure-cli/blob/dev/src/azure-cli/azure/cli/command_modules/appservice/custom.py#L720