Change seek shortcut keys

Description

Currently, the seek operation hotkeys are mapped to KEYCODE_MEDIA_FAST_FORWARD and KEYCODE_MEDIA_REWIND. The main issue is that none of the keyboards or Bluetooth remotes I own have these keys.

I even looked into buying a compact keyboard that includes them, but couldn’t find one that fits my needs. I also have a programmable keyboard, but its software doesn’t allow me to input keycodes manually, and since these media keys are pretty rare, they’re not recognized by the software for the keyboard either.

Given how uncommon these keys are, would it make sense to add alternative shortcuts, like < and > for seeking? Something like:

if (event.getKeyCode() == KeyEvent.KEYCODE_COMMA &&
    event.isShiftPressed()) {
    // This is '<'
}

if (event.getKeyCode() == KeyEvent.KEYCODE_PERIOD &&
    event.isShiftPressed()) {
    // This is '>'
}

I'm happy to create a PR, it looks like a straightforward change, but wanted to check if others are okay with it first