feat(ui5-view-settings-dialog): add group option

[didip1000]

This feature introduces a new Group option to the ui5-view-settings-dialog allowing users to select a group of options and in what way they should be ordered, similar to the Sort option.

To use the Group option, we introduced a ui5-group-item that can be slotted in the groupItems slot of a ui5-view-settings-dialog. The following example is how the ui5-group-item can be used:

<ui5-view-settings-dialog id="vsd1" sort-descending>
    <ui5-group-item slot="groupItems" text="Name" selected=""></ui5-group-item>
    <ui5-group-item slot="groupItems" text="Position"></ui5-group-item>
    <ui5-group-item slot="groupItems" text="Company"></ui5-group-item>
    <ui5-group-item slot="groupItems" text="Department"></ui5-group-item>
    <ui5-group-item slot="groupItems" text="(Not Grouped)"></ui5-group-item>
</ui5-view-settings-dialog>

With that example, the view settings dialog will look something like this:

Fixes: #11815

[Copilot]

Pull Request Overview

This PR introduces a new Group option to the ui5-view-settings-dialog component, allowing users to select grouping criteria for data organization similar to the existing Sort functionality.

Key changes:

• Added new ui5-group-item component for defining group options
• Extended ViewSettingsDialog to support grouping alongside sorting and filtering
• Updated event details and settings to include group-related properties

Reviewed Changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/fiori/src/GroupItem.ts	New component definition for group items with text and selected properties
packages/fiori/src/ViewSettingsDialog.ts	Extended to support group functionality with new properties, methods, and event details
packages/fiori/src/ViewSettingsDialogTemplate.tsx	Updated template to render group UI and consolidated sort/group rendering logic
packages/fiori/src/types/ViewSettingsDialogMode.ts	Added Group mode enum value
packages/fiori/src/i18n/messagebundle.properties	Added i18n keys for group-related labels and tooltips
packages/fiori/test/pages/ViewSettingsDialog.html	Added test page example with group functionality
packages/fiori/cypress/specs/ViewSettingsDialog.cy.tsx	Added comprehensive test coverage for group functionality
packages/website/docs/_samples/fiori/ViewSettingsDialog/Basic/sample.html	Updated sample to demonstrate group items usage

[ui5-webcomponents-bot]

🎉 This PR is included in version v2.15.0-rc.0 🎉

The release is available on v2.15.0-rc.0

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