Support passing jams kwargs to muda's load/save functions

[justinsalamon]

It would be helpful to be able to pass jams kwargs to muda's load_jam_audio() and save() methods. Example use case: I want to skip json validation upon loading (via muda.load_jam_audio()) or saving (via muda.save()).

[bmcfee]

Can't do general kwargs because both load_jam_audio and save already use kwargs for manipulating audio io.

We could expose strict and validate for jams though.

[justinsalamon]

We could expose strict and validate for jams though.

👍