Add support for TikTok cookie

[mikirejf]

describe the feature you'd like to see

Cookies are already supported for many other platforms (https://github.com/imputnet/cobalt/blob/main/docs/examples/cookies.example.json). It would be useful to have it for TikTok also since some of the content is age restricted and requires you to be logged in to access/download.

Cookie signature: "tiktok": [ "sessionid_ss=<replace_this>" ]

Example tiktok: https://www.tiktok.com/@kingsley.502/video/7512888850964991278

Thank you! <3