feat(YouTube - Change start page): Add "playlists" start page

[egcmi]

Feature description

under revanced settings > general > set start page add a "playlists" option as a start page to automatically open your (own channel) playlists. kind of what navigating to https://www.youtube.com/feed/playlists would achieve

Motivation

in the settings it's possible to pick from a wide range of possible start pages. i have several playlists that i like to save videos for later. it's like the watch later playlist, but instead of just one i have a few that are categorized depending on the types of videos, podcasts, music, etc. i choose one to play depending on mood and/or what/if i'm doing in the meantime. e.g. i will pick something i can just listen to if i'm driving, walking, doing chores, etc. or something that requires my visual attention only if i'm not busy with something else. i could set watch later as my start page if that was my only playlist where i save videos for later, but since i have a few i often play from, i would like to have an overview of my various playlists when i open the app. in the past i was able to add a custom start page by using this setting through the import/export tool:
"start_page": "www.youtube.com\/feed\/playlists",
however it hasn't been working for a few months (i am aware that the setting is now called change_start_page and i tried editing that, but it didn't work).
kind of a minor feature. another option would be to make the start page completely customizable (e.g. by setting a valid link, as it worked in the past)

thanks to all the revanced team. i'd consider contributing myself (i am a dev) but i have no android experience and trying to navigate the codebase seems daunting. let me know if you need further info.

Acknowledgements

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