Add site_config_resource column in table azure_app_service_web_app_slot

[khushboo9024]

Is your feature request related to a problem? Please describe.

Add site_config_resource column in table azure_app_service_web_app_slot

https://pkg.go.dev/github.com/Azure/azure-sdk-for-go@v58.0.0+incompatible/services/web/mgmt/2020-06-01/web#AppsClient.GetConfigurationSlot

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[misraved]

@khushboo9024 as per the output structure, we have decided to use site_config_resource as the column name.

Reference - https://pkg.go.dev/github.com/Azure/azure-sdk-for-go@v58.0.0+incompatible/services/web/mgmt/2020-06-01/web#SiteConfigResource