feat: Add pipeline_kwargs to TransformersSummarizer

[sjrl]

Related Issues

• fixes N/A
• Needs PR feat: Add model kwargs to SentenceTransformersRanker #6627 for the extract_torch_dtype method

Proposed Changes:

• fixes slow inference and indexing times for a client's pipeline that uses the TransformerSummarizer
• use batching in the predict method since multiple documents are usually passed at inference time
• allow the model to be loaded in torch.float16 by adding pipeline_kwargs to the init method

How did you test it?

• added unit tests

Notes for the reviewer

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.
• I documented my code
• I ran pre-commit hooks and fixed any issue

[masci]

LGTM!