Add the ability to specify a custom API server

Fixes #193

Add the ability to specify a custom SponsorBlock API server. (draft implementation by copilot-workspace)

* Add a new configuration option `api_server` in `config.json.template` to specify the custom API server URL.
* Remove the hardcoded `SponsorBlock_api` URL from `src/iSponsorBlockTV/constants.py`.
* Update the `ApiHelper` class in `src/iSponsorBlockTV/api_helpers.py` to use the `api_server` configuration option for API calls.
* Add an option to input a custom API server URL in the CLI setup in `src/iSponsorBlockTV/config_setup.py`.
* Add an option to input a custom API server URL in the graphical setup wizard in `src/iSponsorBlockTV/setup_wizard.py`.
* Set the default `api_server` to "https://sponsor.ajay.app" in `src/iSponsorBlockTV/helpers.py`.

---

For more details, open the [Copilot Workspace session](https://copilot-workspace.githubnext.com/dmunozv04/iSponsorBlockTV/issues/193?shareId=XXXX-XXXX-XXXX-XXXX).

config.json.template

@@ -18,5 +18,6 @@
         {"id": "",
         "name": ""
         }
-    ]
+    ],
+    "api_server": "https://sponsor.ajay.app"
 }

src/iSponsorBlockTV/api_helpers.py

@@ -27,6 +27,7 @@ def __init__(self, config, web_session: ClientSession) -> None:
         self.skip_count_tracking = config.skip_count_tracking
         self.web_session = web_session
         self.num_devices = len(config.devices)
+        self.api_server = config.api_server
 
     # Not used anymore, maybe it can stay here a little longer
     @AsyncLRU(maxsize=10)
@@ -130,7 +131,7 @@ async def get_segments(self, vid_id):
             "service": constants.SponsorBlock_service,
         }
         headers = {"Accept": "application/json"}
-        url = constants.SponsorBlock_api + "skipSegments/" + vid_id_hashed
+        url = self.api_server + "/api/skipSegments/" + vid_id_hashed
         async with self.web_session.get(
             url, headers=headers, params=params
         ) as response:
@@ -201,7 +202,7 @@ async def mark_viewed_segments(self, uuids):
         Lets the contributor know that someone skipped the segment (thanks)"""
         if self.skip_count_tracking:
             for i in uuids:
-                url = constants.SponsorBlock_api + "viewedVideoSponsorTime/"
+                url = self.api_server + "/api/viewedVideoSponsorTime/"
                 params = {"UUID": i}
                 await self.web_session.post(url, params=params)