Experimentally implement WNFS under Noosphere

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The rs-wnfs project is reaching a level of maturity where we may experimentally implement it as a mechanism to store Noosphere content. We have speculated that it may make a good candidate for #13 , but it also features a "public" file system that may be a suitable substitute for the slug/memo-based content space currently implemented by Noosphere.

I filed wnfs-wg/spec#67 to inquire about UnixFS requirements in WNFS' public filesystem. Putting that aside for a second, it would be interesting to investigate the implications of using a public WNFS filesystem as a substitute for Noosphere's current public content space.

And, of course, it would be interesting to investigate using the private filesystem as a candidate solution to #13.