feat: reusable IDP schema and types (#139)

## What

* add reusable IDP schema and types

## Why

* more DRY

## Notes
<!-- Add any notes here -->

## Checklist

* [ ] _I have read
[CONTRIBUTING.md](https://github.com/codefresh-io/terraform-provider-codefresh/blob/master/CONTRIBUTING.md)._
* [ ] _I have [allowed changes to my fork to be
made](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/allowing-changes-to-a-pull-request-branch-created-from-a-fork)._
* [ ] _I have added tests, assuming new tests are warranted_.
* [ ] _I understand that the `/test` comment will be ignored by the CI
trigger [unless it is made by a repo admin or
collaborator](https://codefresh.io/docs/docs/pipelines/triggers/git-triggers/#support-for-building-pull-requests-from-forks)._

Author: korenyoni

codefresh/internal/idp/doc.go

@@ -0,0 +1,2 @@
+// Package idp is shared by idp-related resources.
+package idp