Add support for env variables for box and reasource_box PHR-12343

[ratkayandras]

Jira ticket

Support environment variables in aidbox provider

This work is needed so we can create aidbox boxes in our multibox deployment with various enviromnet variables set on the box level. WIth this we should be able to bring up boxes with additional features (e.g.: support for aidbox forms)

What to look for

In box.go I added

Env map[string]string `json:"env,omitempty"`

The reason for this beaing a map is that I conformed to the aidbox api for creating boxes.

in resource_box.go I map between []string and map[string]string because on the terraform side we set the enfironment variables as a list string:

resource "aidbox_box" "my_box" {
  id           = "my-box"
  fhir_version = "fhir-3.0.1"
  description  = "A box instance within multibox, a multi-tenant aidbox server"
  env = [
    "ENV1=foo",
    "ENV2=bar"
  ]
}

Setting the evironment variables is optional so every existing test passed and I added a new test which tests if the variables are properly set.

[MFAshby]

LGTM