feat(ui5-form): add new emptySpan property

[ilhan007]

Background

Adds new emptySpan property that provides additional layout flexibility by defining empty space at the form item’s end.

Example: Setting "S0 M0 L3 XL3" (or just "L3 XL3") adjusts the layout as follows:

• Label: remains 4 cells.
• Field: is reduced to 5 cells.
• Empty space: 3 cells are added at the end.
  Greater values increase the empty space at the end of the form item, reducing the space available for the label and its field.

Recommended value:
Setting emptySpan to 1 cell is typically sufficient to achieve a balanced layout.

Note:

• The maximum allowable empty space is 10 cells. At least 1 cell each must remain for the label and the field.
• When emptySpan is specified (greater than 0), ensure that the combined value of emptySpan and labelSpan does not exceed 11. This guarantees a minimum of 1 cell for the field.

Usage

<ui5-form empty-span="L1 XL1"></ui5-form>

Without empty span

With empty span

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Fixes: #9963

[ui5-webcomponents-bot]

🎉 This PR is included in version v2.5.0-rc.2 🎉

The release is available on v2.5.0-rc.2

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