Be able to mute a media_player

**Describe the problem you have/What new integration you would like**

Currently I have a media player running ESPHome that produces a hiss when idle. When I use HomeAssistant to mute the media player, it stops the hiss. My automations using that player always mute it once finished (which is fine).

However, it looks like there's no volume_mute service on a media_player in ESPHome itself.

**Please describe your use case for this integration and alternatives you've tried:**

I would like the ESPHome device to be as self-contained as possible, needing no additional help from HA. Running a mute service on/after boot would make it possible that the device always starts up muted.

The only feasible alternative is to have an automation in HA that checks when the media player changes state _from_ unavailable, and use that to mute it.

**Additional context**

N/A