new-style wire protocol implementation for find*() methods #262
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Starting from maxWireVersion=4 (v3.2) MongoDB migrated to new implementation of CRUD methods based on commands commands instead of
OP_*low-level message codes.We already support new-style commands for insert, update, replace and delete (when called as
*_one/*_many). This patch adds support for find*() methods too and uses it by default if maxWireVersion ≥ 4.This also (hopefully) makes txmongo compatible with Azure's Cosmos DB that only supports new-style API.
In future this will allow us to support sessions and transactions because it only supported for new-style queries.