Add Validate button to the edit window

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

When editing the yaml config of a device it would be helpful to have the validate button along the top of the page beside the save and install buttons.

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

Having to save the config close the edit window and then run the validate option is a cumbersome process. I'm only new to esphome so I like to make a few small changes and validate that the changes are valid before starting the next steps. It would be a great help to be able to save and validate all from the edit window.

**Additional context**

Start by locating the YAML configuration edit window and the existing Save, Install, and Validate actions. Confirm how validation is currently triggered, then make the Validate action available beside Save and Install; done means validation can be run without closing the edit window.

Written by the indexing model from the issue text.