feat(vectorstore): adds firestore vector store support (#1600)

.changeset/lemon-pumas-end.md

examples/firestore/.env.template

examples/firestore/README.md

examples/firestore/delete.ts

examples/firestore/load.ts

examples/firestore/query.ts

examples/package.json

packages/providers/storage/firestore/CHANGELOG.md

packages/providers/storage/firestore/package.json

...s/providers/storage/firestore/src/FirestoreVectorStore.ts

packages/providers/storage/firestore/src/index.ts

packages/providers/storage/firestore/tsconfig.json

pnpm-lock.yaml

tsconfig.json