perf(engine): Use asyncio eager task factory for worker event loop

[daryllimyt]

Features

• Use asyncio eager task factory for worker event loop
• Improve asyncio performance on coroutines that can complete before being scheduled on the event loop

References

• https://github.com/python/cpython/issues/104144
• Backed by data from Instagram: https://github.com/python/cpython/issues/97696