Multi-day event livestreams not exposed to the ftc-api

**Is your feature request related to a problem? Please describe.**
Multi-day events, for example Premier Events en the FIRST Championship often have a livestream per day, these are listed in the ftc-events page, but are missing in the api.

**Describe the solution you'd like**
Add the livestreams per day in the api, listed with a data.

**Describe alternatives you've considered**
There seem to be 2 alternative solutions:
- Scraping the ftc-events (NOT AN SOLUTION)
- Manually adding livestreams in personal db's (current solution, but unwanted)

**Additional context**
We want to reference the correct livestream url on the FTCScout page, now we put them in per event we find, but that is by far not all of them.