Umutuzgur/tackle computed alert settings fields

[umutuzgur]

Affected Components

• Resources
• Test
• Docs
• Tooling
• Other

Pre-Requisites

• Terraform code is formatted with terraform fmt
• Go code is formatted with go fmt
• plan & apply command of demo/main.tf file do not produce diffs

Notes for the Reviewer

• Turn TypeSet into TypeList in alert settings and the nested attirubtes in their so TF diff detection uses the position of the value instead of the hash of the value, this doesn't work well with computed values
• Add computed field to the alert settings fields so client state persists the server defaults

[Antoine-C]

Nice 👏