feat: add types for wrapper event emitters

[MariaIDineva]

Related Issue(s)

part of #13176

Description

1. Adds some wrapper generator logic that exports a custom UI5WrapperCustomEvent type from the ui5-webcomponents-base package. That type can be used to provide proper typing for all components outputs, thus avoiding imports of types and classes from the webcomponents dist folder.

Before:

// Import UI5 custom event types
import { UI5CustomEvent } from '@ui5/webcomponents-base';
import { default as _TextArea } from '@ui5/webcomponents/dist/TextArea.js';

onTextAreaChange(fieldName: string, event: UI5CustomEvent<_TextArea, 'input'>): void { }

Now:

import type { UI5WrapperCustomEvent } from '@fundamental-ngx/ui5-webcomponents-base';

onTextAreaChange(fieldName: string, event: UI5WrapperCustomEvent<TextArea, 'ui5Input'>): void {

2. Cleans up the generator logic a bit from unused parameters.

3. Adjusts some of the examples to use the new type for the outputs.

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[InnaAtanasova]

Maybe create a type for { url: string; title: string; description: string; gradient: string }? Later if new props are added will be easier to modify just in one place.