feat: export AutoPopulate and Job in public API

Ecosystem packages like datajoint-worker need isinstance checks against
AutoPopulate and direct Job construction for FreeTable progress queries.
Export both from the top-level package so they don't depend on internal
module paths.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: dimitri-yatsenko

src/datajoint/__init__.py

@@ -30,6 +30,8 @@
     "list_schemas",
     "Table",
     "FreeTable",
+    "AutoPopulate",
+    "Job",
     "Manual",
     "Lookup",
     "Imported",
@@ -81,6 +83,8 @@
 from .logging import logger
 from .objectref import ObjectRef
 from .schemas import _Schema, VirtualModule, list_schemas, virtual_schema
+from .autopopulate import AutoPopulate
+from .jobs import Job
 from .table import FreeTable as _FreeTable, Table, ValidationResult
 from .user_tables import Computed, Imported, Lookup, Manual, Part
 from .version import __version__