QueryBuilder returns JSON Results

Developers want to use native object types within their app's view and controller layers and do not want to use Couchbase Lite document types directly within their view layers.

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PRD: https://docs.google.com/document/d/103CYes0UQJ7y9-qtsy-vK8_Uziw_TdF-imhRBrNeOF8/edit# (partial)

API: https://docs.google.com/document/d/1H0mnutn-XXIADvGT_EjINAOVwt0Ea8vwW70v0i_PO54/edit?ts=60369f6e#heading=h.pp69qv5xq2la

Document the Query Resultset elements for this change