* Added generation of random data with mixed data types
* Generation of random dates and doubles
* Some refactoring of the python generation framework wrt types
* Extend the data generation Python framework for cost calibration to support data generation for CE testing as follows:
- the entry point is ce_generate_data.py,
- the configuration of the generated data is in ce_generate_data_settings.py,
- all collection data is exported into a single JSON file stored in 'jstests/query_golden/libs/data', and a schema file stored in the same directory
* Implement a JS data loader function that also creates all indexes specified in the schema file.
* Add a small JS test that shows how to load the generated JSON files into collections.
Juan Gu
Steve McClure
Timour Katchaounov
Alexander Ignatyev
Hana Pearlman
Ruoxin Xu