Add utilities for creating and executing flow bundles

[desertaxle]

This PR adds an experimental bundles module containing the first initial utilities for working with flow bundles that will transport execution between different infrastructures.

The introduced utilities are:

• create_bundle_for_flow_run which will take a flow, flow run, and context and serialize them for transport and storage. The flow and context are cloudpickled, gzipped, and base64 encoded for portability and storage effeciency.
• execute_bundle_in_subprocess which will take a bundle and send it to a subprocess for extraction and execution. This will be used by the Runner to execute bundles downloaded from remote storage.

This PR also introduces a handle_engine_signals context manager to consolidate handling signals and exceptions from an engine instance since the handling had been duplicated in a few places.

Related to #17194

[codspeed-hq]

CodSpeed Performance Report

Merging #17178 will not alter performance

_{Comparing experimental-bundles (52ccc99) with main (168280f)}

Summary

✅ 2 untouched benchmarks

[zzstoatzz]

nice!

[zzstoatzz]

hmm, I'm likely missing something - why this is expected?

[desertaxle]

The flow raises an abort, which causes the flow to stop running immediately without any state changes. This test ensures that the process has a 0 exit code in this case and I wanted to check to make sure the flow entered running before aborting.