Make scheduled tasks configurable via worker.configure_scheduled_tasks()

[andystaples]

Summary

Replaces the free function configure_scheduled_tasks(worker) with a TaskHubGrpcWorker.configure_scheduled_tasks() method, for consistency with the existing worker registration API (add_orchestrator, add_entity, add_capability, use_versioning).

The scheduled tasks feature is still unreleased (## Unreleased in the changelog), so this is a clean breaking change to a single canonical pattern rather than a deprecation.

Changes

• Added TaskHubGrpcWorker.configure_scheduled_tasks(). It lazily imports the schedule entity/orchestrator to avoid a circular import (durabletask.scheduled imports from durabletask.worker).
• Removed the now-redundant durabletask/scheduled/registration.py module and its configure_scheduled_tasks export from durabletask.scheduled.
• Updated the example, unit/e2e tests, docstrings, and changelog to the method form.

The azuremanaged DurableTaskSchedulerWorker inherits the method automatically, so no provider code changes were needed.

Testing

• flake8 clean on changed core files.
• Affected scheduled unit and in-memory e2e tests pass. (The dts-marked azuremanaged e2e requires the emulator and was not run locally.)

[Copilot]

Pull request overview

This PR refactors the scheduled-tasks worker setup API by moving configuration from a free function (durabletask.scheduled.configure_scheduled_tasks(worker)) to a first-class method on TaskHubGrpcWorker (worker.configure_scheduled_tasks()), aligning it with the existing worker registration patterns.

Changes:

• Added TaskHubGrpcWorker.configure_scheduled_tasks() (lazy-importing scheduled components to avoid circular imports).
• Removed durabletask/scheduled/registration.py and stopped exporting configure_scheduled_tasks from durabletask.scheduled.
• Updated examples, tests (core + azuremanaged), and changelog to use the method-based configuration.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
durabletask/worker.py	Introduces configure_scheduled_tasks() on the worker and updates capability-related docs/comments accordingly.
durabletask/scheduled/__init__.py	Updates package docstring and removes the configure_scheduled_tasks export.
durabletask/scheduled/registration.py	Removes the legacy free-function registration module.
examples/scheduled_tasks.py	Updates the scheduled tasks example to use worker.configure_scheduled_tasks().
tests/durabletask/scheduled/test_scheduled_e2e.py	Updates core scheduled e2e test to use the new worker method.
tests/durabletask/scheduled/test_client_filter_and_capability.py	Updates capability advertisement test to call the new worker method.
tests/durabletask-azuremanaged/scheduled/test_dts_scheduled_e2e.py	Updates azuremanaged scheduled e2e test to use the inherited worker method.
CHANGELOG.md	Updates Unreleased entry to reflect the method-based configuration.