feat: support for authenticated media

[td-famedly]

The ideal way to fix this would be autogen with the v1.11 spec. But because it changed from openapi v2 to v3 that looks like a bit more work than expected. Separating out auth media stuff from that because of urgency.

To test these changes please make sure your server properly registers the new media endpoints. Famedly servers do not atm because of worker misconfiguration. Tracking issue: https://github.com/famedly/infra-meta/issues/1688

[krille-chan]

Making the getDownloadLink and getThumbnail methods async seems to be okay. I checked it in FluffyChat and there it always looks like it is not that big of a deal to use it this way. So we can be sure we always have the correct link. Thank you very much