feat: add support for ChromaDB vector store (#82)

.changeset/unlucky-bikes-eat.md

helpers/env-variables.ts

helpers/python.ts

helpers/types.ts

questions.ts

templates/components/vectordbs/python/chroma/generate.py

templates/components/vectordbs/python/chroma/index.py

templates/components/vectordbs/python/chroma/vectordb.py

templates/components/vectordbs/typescript/chroma/generate.ts

templates/components/vectordbs/typescript/chroma/index.ts

templates/components/vectordbs/typescript/chroma/shared.ts

templates/types/streaming/express/package.json

templates/types/streaming/nextjs/package.json