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/280_prefix_vlan_roles.py

@@ -1,15 +0,0 @@
-import sys
-
-from ipam.models import Role
-from startup_script_utils import load_yaml
-
-roles = load_yaml("/opt/netbox/initializers/prefix_vlan_roles.yml")
-
-if roles is None:
-    sys.exit()
-
-for params in roles:
-    role, created = Role.objects.get_or_create(**params)
-
-    if created:
-        print("⛹️‍ Created Prefix/VLAN Role", role.name)