Specifically, introduce the `gen_keys/1` and `assert_search/6` functions
into yokozuna_rt module and refactor tests to use them instead of copied
and pasted code fragments.
* add new types for dialyzer
* add test to reload schema and overwrite it on type change
* test nested search (e.g. nested json objects)
* test re-putting fields, include crdt map workaround, discussed in
https://gist.github.com/sdebnath/36c235e042cb35db7d1f
* increase aae concurrency for core_prop test
(cherry picked from commit 16ce998e3f)
