[feat] Allow resuming of a song that was previously playing.

[SketchNI]

Description
Let's say I'm playing "Cliffs of Dover" by Eric Johnson and at 2 minutes 30 seconds, I close my browser. A few hours later, I reopen Koel in my browser and want to resume the song from that point but I can't.

Example
This could be achieved (maybe?) by writing the song uuid and progress to localStorage every few seconds and when initiating a new session in koel, check for koelMediaResume in localStorage, pull the song and set the progess to the last recorded timestamp.

[phanan]

Yeah, I've been thinking of the idea of maintaining the listening session (current song, current time, and current queue) but don't have time yet. The ideal case would be that these are synced between browsers/devices as well.