Reworked devices and sites - added new attribute to manage local connection to IAS

• Made si- and lt- networks optional
• Added a new attr to manage when you need lt-
• si- is probably gonna. die
• moved ts_address from device to site.

gso/products/product_blocks/device.py

@@ -95,4 +95,4 @@ class DeviceBlock(DeviceBlockProvisioning, lifecycle=[SubscriptionLifecycle.ACTI
     device_site: SiteBlock
     """The {class}`Site` that this device resides in. Both physically and computationally."""
     device_is_ias_connected: bool
-    """The device is going to have a lt interface between inet0 and IAS"""
+    """The device is going to have a LT interface between inet0 and IAS"""