feat(amazonq): add open settings command

[jpinkney-aws]

Problem

chat-client will send an event to VSCode indicating what setting should be opened

Solution

implement the event handler

I can't get this to actually trigger so this code is theoretical for now

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[github-actions]

• This pull request modifies code in src/* but no tests were added/updated.
  • Confirm whether tests should be added or ensure the PR description explains why tests are not required.
• This pull request implements a feat or fix, so it must include a changelog entry (unless the fix is for an unreleased feature). Review the changelog guidelines.
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[justinmk3]

might as well be as any, since as means this doesn't actually achieve any type-checking. and that avoids needing to export SettingsProps.

[justinmk3]

Suggested change

	const params = message.params as OpenSettingsParams
	const setting = params.settingKey as keyof SettingsProps
	const params = message.params as any
	const setting = params.settingKey as any