Aleph-alpha-client

- Add attention manipulation parameters on character level

- Introduce offline tokenizer
- Add method `models` to Client and AsyncClient to list available models
- Fix docstrings for `complete` methods with respect to Prompt construction
- Minor docstring fix for `evaulate` methods

- fix complete in deprecated client: pass None-lists as empty list

- add completion parameters: completion_bias_inclusion, completion_bias_inclusion_first_token_only
completion_bias_exclusion, completion_bias_exclusion_first_token_only

- add completion parameters: minimum_tokens, echo, use_multiplicative_frequency_penalty,
sequence_penalty, sequence_penalty_min_length, use_multiplicative_sequence_penalty

- fix type hint in DetokenizationResponse