Feature Request: Add an "active" class to active/current page links on the pagination component

Issue Type: Enhancement

Description: It would be nice if on the pagination portion of the a results component, when a page is selected an "active" class is added to the HTML element, allowing greater customization through an application's css rules.

Example of current system:

In the below example, the user is currently on page 2. You can see that React has changed the link's class from css-1vy3jc0 to css-r1uvgb, which styles the background color of the link to the theme's primaryColor, but since there is no "active" class added, it can't be overridden/customized via the application's css.

<ResultCard
    ...
    innerClass={{
        pagination: 'pagination'
    }}
/>

<div class="css-11s5mbb pagination">
    <a class="css-1vy3jc0 css-19ogrg70">Prev</a>
    <a class="css-1vy3jc0 css-19ogrg70">1</a>
    <a class="css-r1uvgb css-19ogrg70">2</a>
    <a class="css-1vy3jc0 css-19ogrg70">3</a>
    <a class="css-1vy3jc0 css-19ogrg70">4</a>
    <a class="css-1vy3jc0 css-19ogrg70">5</a>
    <a class="css-1vy3jc0 css-19ogrg70">Next</a>
</div>

Reactivesearch version: 2.2.1

Also note, the ToggleButton component adds an "active" class to selected buttons, so this change would make the pagination consistent with that.

appbaseio / reactivesearch

Feature Request: Add an "active" class to active/current page links on the pagination component #264