fix(types): update installExtraPlugins to support Promise return type

[davidglezz]

Pull request template

Describe the purpose of the change, the specific changes done in detail, and the issue you have fixed.

Motivation and context

Allow installExtraPlugins to return a Promise in the type.
The implementation/usage already allows it

x/packages/x-components/src/x-installer/x-installer/x-installer.ts

Lines 246 to 250 in 48cedcd

	protected installExtraPlugins(bus: XBus<XEventsTypes, WireMetadata>): Promise<void> {
	return Promise.resolve(
	this.options.installExtraPlugins?.({ app: this.app, snippet: this.snippetConfig!, bus })
	);
	}

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• Open issue. If applicable, link:

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that causes existing functionality to not work as expected)
• Change requires a documentation update

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• Main
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How has this been tested?

Tests performed according to testing guidelines:

Checklist:

• My code follows the style guidelines of this project.
• I have performed a self-review on my own code.
• I have commented my code, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.

[victorcg88]

IMO we should now add to the doc a brief explanation about the return

[davidglezz]

Thanks for your review.
Since the awaited return type is void, the type annotation says everything we need to know (IMO), the change is, from sync function to sync or async function that do not return values (void).