Make "shadow-lg" class optional in Ping-Pong component of IXM Blocks

Problem/Motivation

I’d like to propose an improvement for the Ping-Pong component in the IXM Blocks module. Currently, the shadow-lg class is hardcoded into the template as shown below:

{% set pp_classes = [ 'ping-pong-item', 'shadow-lg', not loop.first ? 'mt-5', ] %}

In some scenarios, applying this class by default may not suit all needs. To provide greater flexibility, I propose making this class optional. This would allow users to enable or disable it via a configuration option within the Ping-Pong block settings, similar to how the Reversed option is handled.

Here is an example of the Reversed option implementation that could be used as a reference:

{# If the "Reversed" option is checked, add it to our row. #}
{% set reversed = false %}
{% if 'Reversed' in item['#paragraph'].field_ping_pong_options.value %}
  {% set reversed = true %}
{% endif %}

Proposed resolution

1. Introduce a similar option for the shadow-lg class in the block settings.
2. Modify the template logic to conditionally apply the class based on whether this option is enabled:
   

   {# If the "Shadow" option is checked, apply the shadow-lg class. #}
   {% set shadow = false %}
   {% if 'Shadow' in item['#paragraph'].field_ping_pong_options.value %}
     {% set shadow = true %}
   {% endif %}
   
   {%
     set pp_classes = [
       'ping-pong-item',
       shadow ? 'shadow-lg',
       not loop.first ? 'mt-5',
     ]
   %}
   

This solution would offer more control over the visual presentation of the Ping-Pong component without requiring template overrides.

Thank you for your consideration. I believe this improvement would be beneficial for developers who require customizable styling.