Pmaw

- changed `before` and `after` to `until` and `since`
- removed `metadata=true` as this is now always enabled
- set `order='desc'` as this replaces `sort`
- set `sort='created_utc'` so that slicing still works as expected
- Read more on [COLO switchover](https://www.reddit.com/r/pushshift/comments/zkggt0/update_on_colo_switchover_bug_fixes_reindexing/)
- refactored metadata usage
- 🎅🎅🎅🎅🎅🎅🎅🎅🎅🎅🎅🎅🎅🎅

- Don't inherit from object in classes
- Removed logging configuration to prevent unexpected results for users

- fix scenario where a result is reported but cannot be returned by Pushshift

- fix index error bug

- Updated logging and set default log level to INFO
- Added `load_cache` static method to `Response` to load cached responses using cache key

- Added support for enriching result metadata using PRAW
- Implemented functional tests
- Reduced `max_ids_per_request` to 500
- Added automated testing
- Increased exception handling specificity
- Added `filter_fn` for custom filtering