* fix issue with logit processor in beam search in Flax
* adding FlaxNoRepeatNGramLogitsProcessor class + unit test
* style correction and code verification
* add FlaxNoRepeatNGramLogitsProcessor to the test_processor_list and test_processor_list_jitted tests
* fix an issue where ngrams are banned only if they appear ==1 time + update description of get_previous_ngrams
* replace non-jit compatible masking of ngrams that are not yet generated with jittable version
* Revert "fix issue with logit processor in beam search in Flax"
This reverts commit 09b70d7e4d.
* add FlaxNoRepeatNGramLogitsProcessor to _get_logits_processor
* change the method of casting to boolean of banned tokens indices
* fix code style
* remove some useless operations + significantly faster computation of update indices using jax.lax.fori_loop
* remove useless loop iterations
* set some variables that were calculated and used multiple times
* fix format
* Result of black 23.1
* Update target to Python 3.7
* Switch flake8 to ruff
* Configure isort
* Configure isort
* Apply isort with line limit
* Put the right black version
* adapt black in check copies
* Fix copies
* move generation_*.py src files into generation/*.py
* populate generation.__init__ with lazy loading
* move imports and references from generation.xxx.object to generation.object
