Added CoTracker for download stats (#925)

Hey! 

Thanks for the amazing library :) 

We are hosting CoTracker model checkpoint
[here](https://huggingface.co/facebook/cotracker/tree/main) and would
like to see the download count. This PR follows [this
one](https://github.com/huggingface/huggingface.js/pull/561/files) to
enable it.

Hope it's correct way to do it, let me know if any changes are needed or
there is a better way to do so.

---------

Co-authored-by: Lucain <lucainp@gmail.com>

packages/tasks/src/model-libraries.ts

@@ -204,6 +204,13 @@ export const MODEL_LIBRARIES_UI_ELEMENTS = {
 		repoUrl: "https://github.com/cartesia-ai/cartesia_mlx",
 		snippets: snippets.cartesia_mlx,
 	},
+	cotracker: {
+		prettyLabel: "CoTracker",
+		repoName: "CoTracker",
+		repoUrl: "https://github.com/facebookresearch/co-tracker",
+		filter: false,
+		countDownloads: `path_extension:"pth"`,
+	},
 	edsnlp: {
 		prettyLabel: "EDS-NLP",
 		repoName: "edsnlp",