new IP trunk migration

Add IP trunk migration, including a refactor of the IP trunk model

gso/products/product_blocks/site.py

 """The product block that describes a site subscription."""
-
+import re
 from typing import Optional
 
 from orchestrator.domain.base import ProductBlockModel
 from orchestrator.types import SubscriptionLifecycle, strEnum
+from pydantic import ConstrainedStr
 
 
 class SiteTier(strEnum):
@@ -19,6 +20,14 @@ class SiteTier(strEnum):
     TIER4 = 4
 
 
+class SnmpCoordinate(ConstrainedStr):
+    """An SNMP coordinate, modeled as a constrained string.
+
+    The coordinate must match the format of `1.35`, `-12.3456`, etc.
+    """
+    regex = re.compile(r"^-?\d{1,2}\.\d+$")
+
+
 class SiteBlockInactive(ProductBlockModel, lifecycle=[SubscriptionLifecycle.INITIAL], product_block_name="SiteBlock"):
     """A site that's currently inactive, see {class}`SiteBlock`."""
 
@@ -26,8 +35,8 @@ class SiteBlockInactive(ProductBlockModel, lifecycle=[SubscriptionLifecycle.INIT
     site_city: Optional[str] = None
     site_country: Optional[str] = None
     site_country_code: Optional[str] = None
-    site_latitude: Optional[float] = None
-    site_longitude: Optional[float] = None
+    site_latitude: Optional[SnmpCoordinate] = None
+    site_longitude: Optional[SnmpCoordinate] = None
     site_internal_id: Optional[int] = None
     site_bgp_community_id: Optional[int] = None
     site_tier: Optional[SiteTier] = None
@@ -41,8 +50,8 @@ class SiteBlockProvisioning(SiteBlockInactive, lifecycle=[SubscriptionLifecycle.
     site_city: Optional[str] = None
     site_country: Optional[str] = None
     site_country_code: Optional[str] = None
-    site_latitude: Optional[float] = None
-    site_longitude: Optional[float] = None
+    site_latitude: Optional[SnmpCoordinate] = None
+    site_longitude: Optional[SnmpCoordinate] = None
     site_internal_id: Optional[int] = None
     site_bgp_community_id: Optional[int] = None
     site_tier: Optional[SiteTier] = None
@@ -62,9 +71,9 @@ class SiteBlock(SiteBlockProvisioning, lifecycle=[SubscriptionLifecycle.ACTIVE])
     site_country_code: str
     """The code of the corresponding country. This is also used for the {term}`FQDN`, following the example given for
     the site name, the country code would end up in the Y position."""
-    site_latitude: float
+    site_latitude: SnmpCoordinate
     """The latitude of the site, used for {term}`SNMP` purposes."""
-    site_longitude: float
+    site_longitude: SnmpCoordinate
     """Similar to the latitude, the longitude of a site."""
     site_internal_id: int
     """The internal ID used within GÉANT to denote a site."""