Add option for additional logo in footer

[alessioventuriniAND]

Here's a formatted GitHub issue for your footer component updates:

Title: Update Footer Component for Multiple Logos

Description: Our footer component needs the following updates:

1. Support Multiple Logos:

   • Allow for two logos instead of just one.
   • Enable setting links for each logo.

2. Default Layout:

   • The default layout should have the logos positioned next to each other.

3. Alternative Layout:

   • Add an option to display the logos on opposite sides of the footer.

4. Consistency with Header Component:

   • Align and standardize this work with the current implementation used in the header component.
   • Follow the multipleLogo implementation:
     • MultipleLogo overrides the default ONS logo if SVGs or images are provided.
     • You can also pass in "ONS logo" to use the default ONS logo.

5. Focus and Hover States:

   • Ensure that the focus and hover states do not create an extra underline.
   • The highlight color should only wrap the SVG and not its margin.

Tasks:

• Modify the footer component to support two logos.
• Implement link settings for each logo.
• Set default layout to have logos next to each other.
• Add an option for logos to be displayed on opposite sides of the footer.
• Standardize implementation with the header component's multipleLogo feature.
• Ensure the focus and hover states meet the specified requirements.

Additional Information:

• Follow the existing implementation for multiple logos in the header component.
• Ensure consistent behavior and appearance across the application.

Similar work was done for the header component, check out that PR #2994