Exitcode0 custom profile attributes

[monde]

Bringing @exitcode0's code #1033 into an Okta branch. Added additional explanation to the PR.

Original PR salutation:

fix #1009
code was mostly inspired by existing code in the repo at resource_okta_group.go#L128-L133

Still very new to Go and TF providers, so if this implementation is sub-par please let me know 😄

intended to work with the below example config

data "okta_groups" "test" {
  type = "OKTA_GROUP"
}

output "test" {
  value = [for group in data.okta_groups.test.groups : group.name if lookup(jsondecode(group.profile), "admin", false) == true]
}

[monde]

@exitcode0 this is released as v3.23.0