* initial experiments
* progress
* draft
* fix header
* fix linting
* lot more lazy inits
* fixes to main init
* linting
* small refinements
* header fix
* release note
* improve consistency
* test: make sure no extra modules are being imported due to `__init__` definitions
* extend release note with an example
* refactoring import test
* updating release notes
* casting .keys() to list
* reverting to list
* Update haystack/__init__.py
Co-authored-by: Julian Risch <julian.risch@deepset.ai>
* fixing ident problem
* better comments
---------
Co-authored-by: David S. Batista <dsbatista@gmail.com>
Co-authored-by: Julian Risch <julian.risch@deepset.ai>
