feat: Add a tool to search a Chroma database

[kylediaz]

Hello from the Chroma team 👋

This adds a basic tool that lets agents query their data in Chroma.

We also unpinned the chromadb version. Ideally, we'd like to get you on >1.0.0 because CrewAI uses ChromaDB for short-term memory. Since we rewrote it in rust, upgrading to 1.0.0 should make Chroma 4x faster, instantly.

import chromadb
from crewai_tools import ChromaSearchTool

client = chromadb.PersistentClient(path="./chroma_db")
collection = client.get_or_create_collection(name="my_documents")

tool = ChromaSearchTool(
    collection=collection,
)