Functionapp:Add ability to create a Function App or Function key directly

Description

The Azure CLI should be able to create a function-app-scoped or function-scoped key in an Azure Function App via the functionapp subcommand. It should also be able to retrieve existing keys.

[worldspawn]

I think the first thing that should happen is have the host keys returned in the result of creating a function app with the cli. Much like when I create storage I get the access keys

[anthonychu]

@ankitkumarr Here’s an attempt at what the commands might look like. Let me know what you think:

Function details and keys:

az functionapp function show --resource-group $RESOURCE_GROUP --name $APP_NAME --slot $SLOT_NAME --function-name $FUNCTION_NAME
az functionapp function list --resource-group $RESOURCE_GROUP --name $APP_NAME --slot $SLOT_NAME
az functionapp function keys list --resource-group $RESOURCE_GROUP --name $APP_NAME --slot $SLOT_NAME --function-name $FUNCTION_NAME
az functionapp function keys set --resource-group $RESOURCE_GROUP --name $APP_NAME --slot $SLOT_NAME --function-name $FUNCTION_NAME --key-name $KEY_NAME --key-value $KEY_VALUE
az functionapp function keys delete --resource-group $RESOURCE_GROUP --name $APP_NAME --slot $SLOT_NAME --function-name $FUNCTION_NAME --key-name $KEY_NAME

Host keys (unsure how this would work with systemKeys and functionKeys):

az functionapp keys list --resource-group $RESOURCE_GROUP --name $APP_NAME --slot $SLOT_NAME
az functionapp keys set --resource-group $RESOURCE_GROUP --name $APP_NAME --slot $SLOT_NAME --key-name $KEY_NAME --key-value $KEY_VALUE
az functionapp keys delete --resource-group $RESOURCE_GROUP --name $APP_NAME --slot $SLOT_NAME --key-name $KEY_NAME