feat: add users and groups support

[mircea-pavel-anton]

Fixes #1

This PR adds support for managing both truenas_users and truenas_groups as resources as well as data sources.

Disclaimer: I did use claude code to help me generate this code. Feel free to dismiss this PR if that does not align with the project goals. I saw a CLAUDE.md file in the repo root so I assumed it would be fine.

I have tested this in my homelab with this code: https://github.com/mirceanton/truenas-apps/tree/feat!/terraform/terraform/truenas

[deevus]

This looks great! The api changes will need to be moved to https://github.com/deevus/truenas-go as services. Once that lands, it should be fairly simple to consume those here as resources.

[deevus]

Rebase and integrate UserService and GroupService from deevus/truenas-go#11

Once tested and confirmed working I will merge upstream.

[mircea-pavel-anton]

found a bug:

resource "truenas_group" "test" { name = "test" }
resource "truenas_user" "test" {
  username     = "test"
  full_name    = "Test User"
  email        = "test@mirceanton.com"
  shell        = "/usr/sbin/nologin"
  group_id = truenas_group.test.id
  groups   = [data.truenas_group.builtin_users.id]
  password     = "test"
}

This config causes the group to also be deleted if i delete the group. need to look into it some more. Will mark this PR as draft until then

[deevus]

This is not what I meant. We shouldn't be calling Client.Call directly from terraform-provider-truenas anymore. In this case you probably want GroupService.GetByName

You will need to use a replace directive to use the code from deevus/truenas-go#11 (clone and checkout the branch locally).