[github] add repository filter to my pull request menu bar and unread notifications

[luarmr]

Description

When collaborating across multiple repositories, you may want to receive notifications for only specific ones. In my case, three repositories are top priority, while the rest don't require such close attention. A coworker raised this in a conversation, which made me think it's a more common issue.

Users can choose which repositories they want to receive notifications from or exclude.

Added to both the pull request and unread notifications menu bars.

Screencast

Checklist

• I read the extension guidelines
• I read the documentation about publishing
• I ran npm run build and tested this distribution build in Raycast
• I checked that files in the assets folder are used by the extension itself
• I checked that assets used in the README are located outside the metadata folder if they were not generated with our metadata tool

[raycastbot]

Thank you for your contribution! 🎉

🔔 @thomaslombart @unnamedd @tonka3000 @khasbilegt @pernielsentikaer @loxygenK @oilbeater @LunaticMuch @aeorge @daquinoaldo @peppy @aeither @marcotf @qeude @nesl247 @xilopaint @antonengelhardt @bangerang @wottpal @LitoMore @d-mitrofanov-v @j3lte @jfkisafk @vlasischar @JavaLangRuntimeException @shyakadavis @sushichan044 you might want to have a look.

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