Custom arrows / nav buttons accessibility.

[angust]

It would be great to be able to pass aria-labels, titles and alt text to the slots for prevButton & nextButton to help with accessibility.

Currently, Buttons do not have an accessible name in the DOM they're simply rendered as:

<button type="button" class="agile__nav-button agile__nav-button--prev">custom content</div>
Maybe if this isn't customizable there should be some generic 'previous slide' / 'next slide' descriptors labels for the buttons.

An example could look like:
<button type="button" class="agile__nav-button agile__nav-button--prev" aria-label="Previous Slide">
There's also some recommendations for markup solutions here: https://dequeuniversity.com/rules/axe/3.3/button-name

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