chore: add wait/ref/get/select to Runner.

[k82cn]

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[gemini-code-assist]

Summary of Changes

Hello @k82cn, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the flamepy library by introducing a suite of new methods to the Runner class, specifically wait, ref, get, and select. These additions aim to simplify and optimize the management of asynchronous operations represented by ObjectFuture instances. By providing batch processing capabilities, developers can more easily coordinate and retrieve results from multiple concurrent tasks, leading to cleaner and potentially more performant code when interacting with the Flame execution environment.

Highlights

• New Runner Methods: The Runner class now includes new utility methods: get(), ref(), wait(), and select(). These methods streamline the handling of multiple ObjectFuture instances, allowing for batch operations like waiting for completion, retrieving results, or iterating over futures as they complete.
• ObjectFuture Enhancements: The ObjectFuture class has been extended with a wait() method, enabling explicit waiting for a single future's completion without immediately fetching its result.
• ObjectFutureIterator Introduction: A new ObjectFutureIterator class has been added, which provides an efficient way to iterate over a collection of ObjectFuture instances as they complete, leveraging concurrent.futures.as_completed.
• Example and Test Updates: Existing examples and test cases have been updated to demonstrate and utilize these new Runner and ObjectFuture capabilities, replacing individual .get() or .ref() calls with the more efficient batch methods.

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[gemini-code-assist]

Code Review

This pull request introduces convenient batch operations get, ref, wait, and select on the Runner class, which simplifies handling multiple ObjectFuture instances. The examples and tests have been updated to use these new APIs. While the new methods are functionally correct, the implementations for get, ref, and wait can be made more efficient by processing futures in parallel rather than sequentially. I've provided suggestions to improve their performance by leveraging Python's concurrent.futures library. The implementation of select is well-done.