Fix The Freeze Hinter #3252

[Jatin24062005]

Making runnig all the tests and
Working When Press the Esc key to dismiss the Hinter.

1.Start typing something with the Hinter enabled.
2.The Hinter window pops up.
3.Press the Esc key to dismiss the Hinter.

Fixes #issue-number

Changes:
Added a keydown event listener in the Completion constructor to monitor key presses on the editor and trigger the handleKeyPress method for custom key handling.

Implemented Escape key functionality in the handleKeyPress method to close the completion widget by calling this.close() and preventing default behavior.
I have verified that this pull request:

• has no linting errors (npm run lint)
• has no test errors (npm run test)
• is from a uniquely-named feature branch and is up to date with the develop branch.
• is descriptively named and links to an issue number, i.e. Fixes #123