Data-diff

What's Changed
* Move common ABCs and types to database_types.py; Fix type annotations by erezsh in https://github.com/datafold/data-diff/pull/98
* Refactor database.py -> databases/*.py, each db gets a file. by erezsh in https://github.com/datafold/data-diff/pull/101
* Small fix for issue 102 by erezsh in https://github.com/datafold/data-diff/pull/104
* readme: update screenshot with BigQuery, remove redundant pair by sirupsen in https://github.com/datafold/data-diff/pull/97


**Full Changelog**: https://github.com/datafold/data-diff/compare/v0.2.0...v0.2.1

What's Changed
* Fix for BigQuery: Table-name no longer needs dataset, takes it from URI by erezsh in https://github.com/datafold/data-diff/pull/77
* Added support for Numeric types with arbitrary precision by erezsh in https://github.com/datafold/data-diff/pull/74
* Refactor Normalize-types into normalize_timestamp() normalize_number() by erezsh in https://github.com/datafold/data-diff/pull/75
* readme: add performance graph by sirupsen in https://github.com/datafold/data-diff/pull/88
* Better errors for missing imports by erezsh in https://github.com/datafold/data-diff/pull/76
* Fix: Only parse relevant columns. Only warn on relevant columns. by erezsh in https://github.com/datafold/data-diff/pull/92
* cli: output diff as jsonl, stats as json by sirupsen in https://github.com/datafold/data-diff/pull/90


**Full Changelog**: https://github.com/datafold/data-diff/compare/v0.0.8...v0.2.0