Added device type interface startup script and sample YAML initializer

Renumber startup scripts to place platform initialization before the devices to enable platform specification during device creation

startup_scripts/270_asns.py

@@ -0,0 +1,33 @@
+import sys
+
+from ipam.models import ASN, RIR
+from startup_script_utils import load_yaml
+from tenancy.models import Tenant
+
+asns = load_yaml("/opt/netbox/initializers/asns.yml")
+
+if asns is None:
+    sys.exit()
+
+required_assocs = {"rir": (RIR, "name")}
+
+optional_assocs = {"tenant": (Tenant, "name")}
+
+for params in asns:
+    for assoc, details in required_assocs.items():
+        model, field = details
+        query = {field: params.pop(assoc)}
+
+        params[assoc] = model.objects.get(**query)
+
+    for assoc, details in optional_assocs.items():
+        if assoc in params:
+            model, field = details
+            query = {field: params.pop(assoc)}
+
+            params[assoc] = model.objects.get(**query)
+
+    asn, created = ASN.objects.get_or_create(**params)
+
+    if created:
+        print(f"🔡 Created ASN {asn.asn}")