[Request] Add support for Platform IO Remote agents

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

I run ESPHome in docker on my server in a closet. This makes it difficult to do initial flashing of new devices. Currently it appears that esphome only supports serial flashing of new devices. OTA flashing is only available for devices that have already had esphome flashed.

PlatformIO supports connecting to remote agents and flashing devices connected to those remote agents. Would be nice if I could do this from the ESPHome UI.

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

Makes initial flashing of new devices with esphome firmware.

I've tried using esptool, but this can be overly complicated for esp32 devices.

I've used the platformio remote agent to do the initial flashing, but it requires me to ssh to my server and open a cli into the docker container and run the pio command manually.

**Additional context**

https://docs.platformio.org/en/latest/plus/pio-remote.html