Make Progress component durations and easings configurable

[mdn522]

Added new props to the Progress component to allow customization of animation durations and easing functions for each phase. This provides greater flexibility for consumers to control the progress bar's behavior. Updated default values and refactored internal usage to use these new props.

[mdn522]

Hi there,

Just wanted to follow up on this pull request.
I believe this feature would be a significant improvement, especially for pages where the progress bar appears. The current default animation duration of 800ms can sometimes feel like a page is still loading, causing unnecessary wait for users on crucial pages. Making the duration configurable would allow developers to fine-tune the experience, helping to ensure the page feels responsive and quick, which is a standard practice on many major company websites, even on GitHub.

Happy to make any changes you suggest. Thanks for your time and consideration!