Add read_scale property to sql database

[r0bnet]

Adds a new property that can be used in combination with Premium and Business Critical SQL databases.

[mbfrahry]

Thanks for this @r0bnet! These changes look good, we just need to make a minor change in the docs and we're good to go

[katbyte]

Thanks for the changes @r0bnet LGTM now 👍

[ghost]

This has been released in version 1.28.0 of the provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading. As an example:

provider "azurerm" {
	version = "~> 1.28.0"
}
# ... other configuration ...

[ghost]

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