Update integratins with Pathway: retriever and reader (#11924)

docs/examples/data_connectors/PathwayReaderDemo.ipynb

docs/examples/retrievers/pathway_retriever.ipynb

...index-readers-pathway/llama_index/readers/pathway/base.py

...ations/readers/llama-index-readers-pathway/pyproject.toml

...retrievers-pathway/llama_index/retrievers/pathway/base.py

.../retrievers/llama-index-retrievers-pathway/pyproject.toml