Defer fastapi type imports in auth (#1557)

## Description of changes

*Summarize the changes made by this PR.*
 - Improvements & Bug fixes
- Defer fastapi type imports in auth code so as not to get a circular
import. Fixes #1554

## Test plan
*How are these changes tested?*

- [x] Tests pass locally with `pytest` for python, `yarn test` for js

## 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)?*

chromadb/auth/fastapi.py

@@ -9,11 +9,6 @@
 from starlette.responses import Response
 from starlette.types import ASGIApp
 
-from chromadb.server.fastapi.types import (
-    CreateDatabase,
-    CreateTenant,
-)
-
 from chromadb.config import DEFAULT_TENANT, System
 from chromadb.auth import (
     AuthorizationContext,
@@ -226,14 +221,14 @@ def wrapped(*args: Any, **kwargs: Dict[Any, Any]) -> Any:
                     if desired_tenant and "tenant" in kwargs:
                         if isinstance(kwargs["tenant"], str):
                             kwargs["tenant"] = desired_tenant
-                        elif isinstance(kwargs["tenant"], CreateTenant):
+                        elif isinstance(kwargs["tenant"], chromadb.server.fastapi.types.CreateTenant):
                             kwargs["tenant"].name = desired_tenant
                     databases = request.state.user_identity.get_user_databases()
                     if databases and len(databases) == 1 and "database" in kwargs:
                         desired_database = databases[0]
                         if isinstance(kwargs["database"], str):
                             kwargs["database"] = desired_database
-                        elif isinstance(kwargs["database"], CreateDatabase):
+                        elif isinstance(kwargs["database"], chromadb.server.fastapi.types.CreateDatabase):
                             kwargs["database"].name = desired_database
 
             return f(*args, **kwargs)