Retrieve stream by guid not by slug title

[hazy-kun]

Is your feature request related to a problem? Please describe.
Sometimes episodes don't have slug title, in this case the downloader crashes 'cause slug title is missing

Describe the solution you'd like
Use fixed endpoint to retrieve series, seasons and episodes data using only the guid.

[bytedream]

The receiving is done by guid. Episodes with empty slug titles also work, from what I saw on the Crunchyroll website, a url is always represented as https://www.crunchyroll.com/watch/<guid>/<slug>. The url works fine if the <slug> part is removed (https://www.crunchyroll.com/watch/<guid>/). Only when the last slash is missing (https://www.crunchyroll.com/watch/<guid>), the url can't be parsed.
But yea I can extend support for urls without a slug and trailing slash