* Integration of SummarizationQAPipeline with Haystack.
* Moving summarizer tests because of OOM issue
* Fixing typo
* Splitting summarizer test in separate ci step
* Removing sysctl configuration as we already running elastic search in docker container
* fixing mypy issue
* update parameter names and docstrings
* update parameter names in BaseSummarizer
* rename pipeline
* change return type of summarizer from answer to document
* change scope of doc store fixture
* revert scope
* temp. disable test_faiss_index_save_and_load()
* fix mypy. change order for mypy in CI
Co-authored-by: Malte Pietsch <malte.pietsch@deepset.ai>
