Files
langchain-python/langchain/vectorstores
Lance Martin be02572d58 Add delete and ensure add_texts performs upsert (w/ ID optional) (#6126)
## Goal 

We want to ensure consistency across vectordbs:
1/ add `delete` by ID method to the base vectorstore class
2/ ensure `add_texts` performs `upsert` with ID optionally passed

## Testing
- [x] Pinecone: notebook test w/ `langchain_test` vectorstore.
- [x] Chroma: Review by @jeffchuber, notebook test w/ in memory
vectorstore.
- [x] Supabase: Review by @copple, notebook test w/ `langchain_test`
table.
- [x] Weaviate: Notebook test w/ `langchain_test` index. 
- [x] Elastic: Revied by @vestal. Notebook test w/ `langchain_test`
table.
- [ ] Redis: Asked for review from owner of recent `delete` method
https://github.com/hwchase17/langchain/pull/6222
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