Release 0.20.0 (#254)

### Added
- Support using envvar in config YAML by @tatiana in #236
- **Callback improvements**
- Support installed code via python callable string by @john-drews in
#221
- Add `callback_file` & `callback_name` to `default_args` DAG level by
@subbota19 in #218
- Cast callbacks to functions when set with `default_args` on TaskGroups
by @Baraldo and @pankajastro in #235

- **Telemetry**
- For more information, please, read the [Privacy
Notice](https://github.com/astronomer/dag-factory/blob/main/PRIVACY_NOTICE.md#collection-of-data).
  - Add scarf to readme for website analytics by @cmarteepants in #219
- Support telemetry during DAG parsing emitting data to Scarf by
@tatiana in #250.

### Fixed
- Build DAGs when tehre is an invalid YAML in the DAGs folder by @quydx
and @tatiana in #184

### Others
- Development tools
  - Fix make docker-run by @pankajkoti in #249
  - Add vim dot files to .gitignore by @tatiana in #228
  - Use Hatchling to modern package building by @kaxil in #208
- CI
  - Fix static check failures in PR #218 by @pankajkoti in #251
  - Fix pre-commit checks by @tatiana in #247
  - Remove tox and corresponding build jobs in CI by @pankajkoti in #248
- Install Airflow with different versions in the CI by @pankajkoti in
#237
  - Run pre-commit hooks on all existing files by @pankajkoti in #245
  - Add Python 3.11 and 3.12 to CI test pipeline by @pankajkoti in #229
- Tests
  - Fix duplicate test name by @pankajastro in #234
  - Add static check by @pankajastro in #231
  - Fix running tests locally (outside the CI) by @tatiana in #227
  - Add the task_2 back to dataset example by @cmarteepants in #204
  - Remove unnecessary config line by @jlaneve in #202
- Documentation
  - Update the license from MIT to Apache 2.0 by @pankajastro in #191
- Add registration icon and links to Airflow references by @cmarteepants
in #190
  - Update quickstart and add feature examples by @cmarteepants #189

### Breaking changes
- Removed support for Python 3.7
- The license was changed from MIT to Apache 2.0

Closes: #217

Release 0.20.0rc1

Fix yml issue

bump version and changelog

bump version and changelog

bump version and changelog

revert kubernetes inheritance change (#158)

* return slightly more meaningful exceptions

* fmt

* return slightly more meaningful exceptions

* cleanup tests

* revert broken change

* remove 1.10.6 test

update changelog and bump version

update changelog and bump version

update changelog and bump version