Use PSFramework for configuration

[SQLDBAWithABeard]

Using $script: scoping for variables can be troublesome. I suggest using PSFramework for configuration control following the practice in dbatools and dbachecks. Linked to #84

[NowinskiK]

I'm happy to take it as I have already introduced the objects' structure for FabricSession, AzureSession and adopted FabricConfig.
Before I start - I will share the design/proposition here.

[NowinskiK]

Full Config Path	Default Value
FabricTools.PowerBiApi.BaseUrl	https://api.powerbi.com/v1.0/myorg
FabricTools.FabricApi.BaseUrl	https://api.fabric.microsoft.com/v1
FabricTools.FabricApi.ResourceUrl	https://api.fabric.microsoft.com
FabricTools.FabricSession.Headers	@{}
FabricTools.FabricSession.TenantId
FabricTools.FabricSession.TokenExpiresOn
FabricTools.FabricSession.AccessToken
FabricTools.AzureApi.BaseUrl	https://management.azure.com
FabricTools.AzureSession.Headers
FabricTools.AzureSession.AccessToken
FabricTools.FabricApi.ContentType	application/json
FabricTools.KustoApi.BaseUrl	https://api.kusto.windows.net
FabricTools.FeatureFlags.EnableTokenRefresh	$true