searchProvider: limit descriptions to 200 characters
searchProvider: limit descriptions to 200 characters

We can only show ~100 on the shell, but we'll send 200 to be safe.
We were often sending far more than that (1000+ characters) over the
bus, which was pretty inefficient.
[endlessm/eos-sdk#2772]

endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib