* feat: Add new timegrains and convert_dttm to Druid engine spec
* Add TemporalType enum and fix test case
* Remove DATETIME for athena (original spec)
* Use PyArrow Table for query result serialization
* Cleanup dev comments
* Additional cleanup
* WIP: tests
* Remove explicit dtype logic from db_engine_specs
* Remove obsolete column property
* SupersetTable column types
* Port SupersetDataFrame methods to SupersetTable
* Add test for nullable boolean columns
* Support datetime values with timezone offsets
* Black formatting
* Pylint
* More linting/formatting
* Resolve issue with timezones not appearing in results
* Types
* Enable running of tests in tests/db_engine_specs
* Resolve application context errors
* Refactor and add tests for pyodbc.Row conversion
* Appease isort, regardless of isort:skip
* Re-enable RESULTS_BACKEND_USE_MSGPACK default based on benchmarks
* Dataframe typing and nits
* Renames to reduce ambiguity
* Fix regression in time grain addons
* Revert privatization of time_grain_functions
* Fix test
* Rename variable
* Fix test
* Fix typing error
* Refactor and add tests
* Add TODO
* Add typing to db_engine_specs
* Add more type annotations and docstrings
* Add docstrings and typing to sql_parse and db_engine_specs
* Refine select_star
* Fix execute and add more docstrings
* Revert kwargs change from execute
* Remove redundant or
* Align view and table getter schema types
* Fix return type of latest_partition
* Remove some typing from presto
* Improve docstring for __extract_from_token
* Add extra_require for bigquery to setup.py
* Refactor df_to_db and add df upload capability for BigQuery
* Fix unit tests and clarify kwarg logic
* Fix flake8 errors
* Add minimum versions for bigquery dependencies
* wrap to_gbq in try-catch block and raise error if pandas-gbq is missing
* Fix linting error and make error more generic
