Add progress tooltip for ArgonSongProgressBar

[CloneWith]

Just referred to the beatmap editor tooltip for implementation and styles.

This is a possibly simple implementation of #30077.

Principle

Since ArgonSongProgressBar takes up all of the DrawWidth, we can use GetContainingInputManager for the X position of the cursor, then converting into the relative X position to the progress bar with ToLocalSpace.

[peppy]

@CloneWith I rewrote every line. Please read through carefully to understand what was lacking.