[ENH] Update client telemetry for developer cloud (#2785)

## Description of changes

Update Posthog telemetry to indicate which events are associated with
Chroma Cloud interactions by clients.

## Test plan

- [x] Tests pass locally with `pytest` for python, `yarn test` for js,
`cargo test` for rust
- [x] Verify on Posthog that we get the new `hosted` property on events,
as well as the new `CloudError` events for errors.

## Documentation Changes
*Are all docstrings for user-facing APIs updated if required? Do we need
to make documentation changes in the [docs
repository](https://github.com/chroma-core/docs)?*

Co-authored-by: Itai Smith <[email protected]>

chromadb/telemetry/product/__init__.py

@@ -64,9 +64,12 @@ def context(self) -> Dict[str, Any]:
         for whitelisted in TELEMETRY_WHITELISTED_SETTINGS:
             telemetry_settings[whitelisted] = settings[whitelisted]
 
+        hosted = self._system.settings.chroma_server_host == "api.trychroma.com"
+
         self._context = {
             "chroma_version": chroma_version,
             "server_context": self.SERVER_CONTEXT.value,
+            "hosted": hosted,
             **telemetry_settings,
         }
         return self._context

docs/docs.trychroma.com/pages/telemetry.md

@@ -39,6 +39,7 @@ We will only track usage details that help us make product decisions, specifical
 
 - Chroma version and environment details (e.g. OS, Python version, is it running in a container, or in a jupyter notebook)
 - Usage of embedding functions that ship with Chroma and aggregated usage of custom embeddings (we collect no information about the custom embeddings themselves)
+- Client interactions with our hosted Chroma Cloud service.
 - Collection commands. We track the anonymized uuid of a collection as well as the number of items
   - `add`
   - `update`