Support for REST APIs

[ceball]

E.g. https://github.com/AlbertDeFusco/tranquilizer (but see panel)

[tonyfast]

@jlstevens @philippjfr could y'all document what has been done and what remains for supporting REST APIs.

[jlstevens]

The new JSON serialization support (https://github.com/holoviz/param/pull/414) goes a long way and does most of the heavy lifting imho. That said, that work needs to support serializing/deserializing entire parameterized classes before it is fully complete. It might be enough to close this issue though...maybe with some example of hooking up to tranquilizer.

[jbednar]

Plus if you want it all taken care of for you, you can pair Param with Panel: https://blog.holoviz.org/panel_0.10.0.html#REST-APIs