Feature/iptrunks prototype

Lots of placeholders in terms of actual deployment, but data gets created correctly.

gso/products/product_blocks/iptrunk.py

 from typing import Optional
 from typing import List
+from pydantic import Field
 
 from orchestrator.domain.base import ProductBlockModel
 from orchestrator.types import SubscriptionLifecycle, strEnum
@@ -74,14 +75,14 @@ class IptrunkBlockProvisioning(IptrunkBlockInactive,
     iptrunk_sideA_node: DeviceBlockProvisioning
     iptrunk_sideA_ae_iface: Optional[str] = None
     iptrunk_sideA_ae_geant_a_sid: Optional[str] = None
-    iptrunk_sideA_ae_members: Optional[list] = None
-    iptrunk_sideA_ae_members_description: Optional[list] = None
+    iptrunk_sideA_ae_members: list[str] = Field(default_factory=list)
+    iptrunk_sideA_ae_members_description: list[str] = Field(default_factory=list)
     #
     iptrunk_sideB_node: DeviceBlockProvisioning
     iptrunk_sideB_ae_iface: Optional[str] = None
     iptrunk_sideB_ae_geant_a_sid: Optional[str] = None
-    iptrunk_sideB_ae_members: Optional[list] = None
-    iptrunk_sideB_ae_members_description: Optional[list] = None
+    iptrunk_sideB_ae_members: list[str] = Field(default_factory=list)
+    iptrunk_sideB_ae_members_description: list[str] = Field(default_factory=list)
 
 
 class IptrunkBlock(IptrunkBlockProvisioning,
@@ -97,11 +98,11 @@ class IptrunkBlock(IptrunkBlockProvisioning,
     iptrunk_sideA_node: DeviceBlock
     iptrunk_sideA_ae_iface: str
     iptrunk_sideA_ae_geant_a_sid: str
-    iptrunk_sideA_ae_members: list[str]
-    iptrunk_sideA_ae_members_description: list[str]
+    iptrunk_sideA_ae_members: list[str] = Field(default_factory=list)
+    iptrunk_sideA_ae_members_description: list[str] = Field(default_factory=list)
     #
     iptrunk_sideB_node: DeviceBlock
     iptrunk_sideB_ae_iface: str
     iptrunk_sideB_ae_geant_a_sid: str
-    iptrunk_sideB_ae_members: list[str]
-    iptrunk_sideB_ae_members_description: list[str]
+    iptrunk_sideB_ae_members: list[str] = Field(default_factory=list)
+    iptrunk_sideB_ae_members_description: list[str] = Field(default_factory=list)