Add support for `min_length` and `min_new_tokens` generation parameters (#308)
* Add support for `MinNewTokensLengthLogitsProcessor`
* Add support for `MinLengthLogitsProcessor`
* Fix `generation_config` defaults
* Fix `input_ids_seq_length`
* Add unit tests for generation
* Fix generation parameters test case
* Allow specification of multiple `eos_token_ids`