nspanel: popups for OTA progress and device info, Info card on every panel

common/nspanel_popup.yaml shows a popupNotify page during OTA (written straight
to the display uart, since OTA blocks the loop that sends the component's
queued commands) and a device info popup (version, build time, IPs) from the
Info button on the new last card or the show_info API action. The OTA gets
id ota_esphome to extend it. Also documents the NSPanel pinout.

common/nspanel.yaml

@@ -31,6 +31,9 @@ esp32:
       minimum_chip_revision: 3.0
       sram1_as_iram: true
 
+packages:
+  popup: !include nspanel_popup.yaml
+
 external_components:
   - source:
       type: git