Jellyfin/Emby: Check partial sync support

- add `is_partial_update_supported` method to each class to validate given version against earliest known supported version
- add `get_server_version` to get server version number
- add `update_partial` parameter to user update function, deciding whether or not to allow partial updates

src/emby.py

@@ -1,4 +1,5 @@
 from src.jellyfin_emby import JellyfinEmby
+from packaging import version
 
 
 class Emby(JellyfinEmby):
@@ -8,7 +9,7 @@ class Emby(JellyfinEmby):
             'Client="JellyPlex-Watched", '
             'Device="script", '
             'DeviceId="script", '
-            'Version="0.0.0"'
+            'Version="6.0.2"'
         )
         headers = {
             "Accept": "application/json",
@@ -19,3 +20,6 @@ class Emby(JellyfinEmby):
         super().__init__(
             server_type="Emby", baseurl=baseurl, token=token, headers=headers
         )
+    
+    def is_partial_update_supported(self, server_version):
+        return server_version > version.parse("4.4")