[FEAT]: Option to show the current playtime as the audio is playing and cursor is advancing

### Description

Allow an option to show the current playtime as the audio is playing and cursor is advancing.

See the <AVWaveform> demo example here: https://staskobzar.github.io/vue-audio-visual/

You can customize the playtime props, as shown here: https://github.com/staskobzar/vue-audio-visual?tab=readme-ov-file#avwaveform-props
