Add the possibility to serve assets via map<String, vec<u8>>

[gerdelma]

Currently it seems like it is only possible to serve asset files via file system or via HTTP.

While this is totally fine for a cli application, I have been wondering, if this would not be a nice addon for the rust crate. Since temporary file handling within a single application feels a bit clunky to me.

Would it be possible to add an option to serve assets in memory for example via map<String, vec>?

Many thanks in advance.