Feature/update input form validation

Update the input forms for site and router creation.

Changes:

• Site country code must exist
• TS server address must be valid
• Router TS port must be valid
• Site latitude and longitude must make sense (-90 < x < 90 and -180 < y < 180)

gso/products/product_blocks/router.py

@@ -13,20 +13,15 @@ class RouterVendor(strEnum):
     """Enumerator for the different product vendors that are supported."""
 
     JUNIPER = "juniper"
-    """Juniper routers."""
     NOKIA = "nokia"
-    """Nokia routers."""
 
 
 class RouterRole(strEnum):
     """Enumerator for the different types of routers."""
 
     P = "p"
-    """P router."""
     PE = "pe"
-    """PE router."""
     AMT = "amt"
-    """AMT router."""
 
 
 class PortNumber(ConstrainedInt):
@@ -36,9 +31,7 @@ class PortNumber(ConstrainedInt):
     """
 
     gt = 0
-    """The lower bound of the valid port number range."""
     le = 49151
-    """As mentioned earlier, the ephemeral port range should not be chosen, and is therefore not available."""
 
 
 class RouterBlockInactive(