Migrate to official databricks provider

[sdebruyn]

Migrated the code to use the databricks provider by databrickslabs.
There are still a couple of issues that would have to be fixed before we can use this:

• you cannot use special chars in the service principal secret: [ISSUE] Azure token auth fails with service principal secret with special characters databricks/terraform-provider-databricks#21
• you cannot create jobs: [ISSUE] Cannot create a job while reusing an existing cluster databricks/terraform-provider-databricks#25
• first apply run fails, second one succeeds: [ISSUE] UnknownWorkerEnvironmentException when creating a cluster after creating a workspace databricks/terraform-provider-databricks#33

Since the last issue also occured with the previous provider ( https://github.com/innovationnorway/terraform-provider-databricks/issues/49 ) and probably won't be fixed very soon, we can merge this as soon as the first 2 issues are fixed.

[github-actions]

terraform fmt Failed

./main.tf

 }
 
 resource "random_password" "aadapp_secret" {
-  length  = 32
+  length = 32
 }
 
 resource "azuread_service_principal" "sp" {

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