* first draft
* incorporate feedback
* some unit tests
* release notes
* real release notes
* first draft
* refactored to use a factory class
* adapt to new ST Embedding Backend implementation
* allow forcing fresh instances
* add tests
* release notes
* fix typo
* little improvements in tests
* Update haystack/preview/embedding_backends/sentence_transformers_backend.py
Co-authored-by: Daria Fokina <daria.fokina@deepset.ai>
* simplify implementation and tests
* lg update
* input check
* better error message
* make factory private
* change return type; improve tests
* warm_up not called in run
* warm_up not called in run
* rm unused import; default model
* fix typing
* rm unused import
* Remove BaseTestComponent
* black
---------
Co-authored-by: Daria Fokina <daria.fokina@deepset.ai>
Co-authored-by: ZanSara <sara.zanzottera@deepset.ai>
