Page sets and actions for clear, load pages

[nagyrobi]

Would be nice to be able to configure multiple sets of pages to be loaded based on various scenarios.

A typical use case is with plates having local relays like Lanbon L8, where the device should be usable even without a network connection.
To differentiate between the case when there's no network connection (yet, or anymore) and when there is, ESPHome's binary_sensor: - platform: status is useful, which could trigger with on_status action loading of a page set containing objects controlling only local relays for when there's no connection with HA, and loading a bigger page set when there is.

Maybe with actions like:

on_...:
  - page.clear:
      id: page1

on_...:
  - page.clear_all:

on_...:
  - pageset.load:
      id: pageset_boot

on_...:
  - pageset.load:
    id: pageset_online

From all pagesets one could be designated as default to load at boot, or if not, one could place a pageset.load action to the esphome.on_boot automation trigger.

Like:

openHASP:
     display: [name of display] # Req
     id: ... # Opt.

     pageset:
       - id: ... # Req.
         default: true # Opt.
     
          pages:
            - id: ... # Opt.

              objects:
                - object: button
                  id: btnHello