Allows our scripts to be run repeatedly with vector store backing and
persistence without throwing an error.

This is rudimentary support which doesn't work if the document has
changed over time.

Also added the insert and delete functions so that documents can be
added manually.

Export storage

Llama2 4bit support

add azure OpenAI

Update OpenAI v4 to latest beta and fixed a few bugs

add constructor to index node so it keeps passed-in indexId

add a filter type to exact match filters

Repo maintenance

Also ran some upgrades on npm/pnpm
pnpm install should install the right packages without the
package-lock.json in the docs folder

This reverts commit 8a433013.

Symlinks didn't quite work

Avoid duplication

upgrade packages
update docs
update README and CONTRIBUTING

dependabot was complaining about the trim version in the docusaurus so
pinned it to a non-vuln version

make VectorStore function signatures unique, export VectorStore types

Anthropic support

Add missing docstrings to NodeParser.ts and handleOpenAIStream.ts

add meta delimitation strategy for llama2