Add a parallel async event handler to OnionMessenger and pass it directly to BackgroundProcessor#3060

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TheBlueMatt merged 8 commits intolightningdevkit:mainfrom

TheBlueMatt:2024-05-parallel-async-om-events

Jun 4, 2024

Commits on May 10, 2024

Create an `AOnionMessenger` trait similar to our other `AStruct`s
TheBlueMatt
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Add a utility to poll multiple futures simultaneously
TheBlueMatt
committed

Commits on May 28, 2024

f docs
TheBlueMatt
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