Bump to v2 API

[drewkim]

Chroma recently introduced v2 of the API. The main change is that routes now include tenant and database in the path. Thus, these values must be resolved before making requests; an example may be observed in the initialization of the Chroma client here. The values are fetched from /auth/identity before being used for further requests.

We plan to deprecate the v1 routes by December 9th so are motivated to get all third party clients up-to-date by then. Please don't hesitate to reach out to [email protected] if you have any questions or need assistance! Thanks!