Provide a REST endpoint to prompt Home Assistant immediate connection to a device

**Describe the problem you have/What new integration you would like**
When using deep sleep devices, on wake up the device must wait for the Home Assistant integration to reconnect to ESPHome which can lead to a fair bit of delay.

If the ESPHome integration presented an invokeable action in Home Assistant that would trigger an immediate connection to a specific ESPHome devices, then devices which have just woken up would be able to request an immediate reconnection from the API.

**Please describe your use case for this integration and alternatives you've tried:**
Using deep sleep capable devices without needing an MQTT integration to achieve prompt runtimes.

**Additional context**

Start by reviewing the ESPHome integration's existing Home Assistant actions and connection handling. Determine how a REST endpoint could target a specific device and trigger an immediate reconnection, then identify the relevant tests and define completion as a callable action that reconnects the requested device promptly.

Written by the indexing model from the issue text.