:bug: Fix denops crash on UnhandledRejection error

[lambdalisue]

Without this PR, errors on for example setTimeout cause Denops crash like

Summary by CodeRabbit

• Bug Fixes
  • Enhanced stability by preventing server crashes from unhandled rejections with a global event listener.

[coderabbitai[bot]]

Walkthrough

This update introduces a global event listener within the denops framework to enhance stability by preventing server crashes. It specifically addresses unhandled promise rejections, ensuring they are caught and managed effectively, thereby improving the resilience and reliability of the denops server.

Changes

File	Summary
denops/@denops-private/worker.ts	Added a global event listener to prevent denops server crashes due to unhandled rejections.

🐇✨
In the code's woven warren, deep and vast,
A rabbit worked, with speed and wit amassed.
"Let's catch these slips, these oversights," it said,
"And keep our denops server smoothly fed."
With every line and loop, it danced with grace,
Ensuring not a single error could give chase.
🌟🐾

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.81%. Comparing base (17fc843) to head (8b92254).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #325 +/- ## ======================================= Coverage 89.81% 89.81% ======================================= Files 9 9 Lines 648 648 Branches 61 61 ======================================= Hits 582 582 Misses 66 66 ```

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