feat: add okta/okta provider

[jakeyheath]

Summary

This PR adds the real head okta/okta Terraform provider as one of the utility providers that fogg produces. This is helpful so that we can have an alias to the head set of changes from the Okta terraform provider and also use an internal fork of the Okta terraform provider to make improvements.

Test Plan

Unit tests

References

• Share provider configuration between an official provider and local fork of that provider assigned a new source address hashicorp/terraform#28823 (comment)
• https://github.com/okta/terraform-provider-okta/blob/3883831416240b3d99108b533e4b7ad3a16cd68e/okta/resource_okta_app_oauth.go#L422-L425
• https://github.com/okta/terraform-provider-okta/blob/3883831416240b3d99108b533e4b7ad3a16cd68e/okta/app.go#L61