feat: add SecurityLevel option on HttpsTrigger (#109)

* feat: add SecurityLevel option on HttpsTrigger

PiperOrigin-RevId: 396889803

Source-Link: googleapis/googleapis@44c497f

Source-Link: googleapis/googleapis-gen@79db627
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiNzlkYjYyNzdlMWFiMzQ4NDVhNDJlZTM5ZDdiNDQ2NmVlZjdkZDVjMCJ9

* 🦉 Updates from OwlBot

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

google/cloud/functions_v1/types/functions.py

@@ -268,9 +268,23 @@ class HttpsTrigger(proto.Message):
         url (str):
             Output only. The deployed url for the
             function.
+        security_level (google.cloud.functions_v1.types.HttpsTrigger.SecurityLevel):
+            The security level for the function.
     """
 
+    class SecurityLevel(proto.Enum):
+        r"""Available security level settings.
+
+        This controls the methods to enforce security (HTTPS) on a URL.
+
+        If unspecified, SECURE_OPTIONAL will be used.
+        """
+        SECURITY_LEVEL_UNSPECIFIED = 0
+        SECURE_ALWAYS = 1
+        SECURE_OPTIONAL = 2
+
     url = proto.Field(proto.STRING, number=1,)
+    security_level = proto.Field(proto.ENUM, number=2, enum=SecurityLevel,)
 
 
 class EventTrigger(proto.Message):