Experiment API v2 (#296)

* WIP implementation

* Finish Adapter work, start test and editing experiments

* Add tests to HF

* Lot of documentation

* Mypy

* Lint

* Add test for Experiment.get_pool

* Update to autotqdm, improve example

* Improve base example

* Fix documentation

* Bump to 2.0.0

Bump version

Baal 1.9.1

Baal 1.9.0

Improve get_indices_for_active_step by caching the result according t… (

#269)

Update version

BaaL 1.6.0

v1.5.1

v1.5.0