[Feature] Add a search filter to the list_devices pairing template

[jghaanstra]

I have users with over 100+ devices making pairing of the right devices a PITA for them. It was requested by a user to add a search filter in the list_devices pairing template. I might be able to solve this within my app by using a custom pairing template but it would be better if this was added in the default list_devices pairing template and for instance shown when there are 15+ devices discovered.

[siggeb]

This would be really useful not only for the Shelly app, but all apps where you tend to have many different devices and maybe only want to integrate certain into homey.