Add Huawei model and TTP template

- Introduced a new `Huawei` model
- Created a corresponding TTP template for Huawei devices.
- Updated the base template to correct HTML entity encoding for vendor placeholders.

oxi/interfaces/models/huawei.py

@@ -0,0 +1,18 @@
+from oxi.interfaces import register_parser
+from oxi.interfaces.base import BaseDevice
+
+
+@register_parser(["vrp", "huawei"])
+class Huawei(BaseDevice):
+    template = "huawei.ttp"
+
+    def vlans(self):
+        vlan_ids = self.raw["vlans"].get("vlan_ids")
+        return [{"vlan_id": vlan} for vlan in vlan_ids]
+
+
+if __name__ == "__main__":
+    with open("./test4.txt") as file:
+        data = file.read()
+    huawei = Huawei(data)
+    print(huawei.parse())