Support editing preloading networks in Android network settings page

[yrliou]

List all networks and allow editing known networks too, such as its RPC URL.
And in the list:

• All networks can be edited.
• Known networks should not be removable.
• Custom networks overriding known ones should be resettable to known.
• Custom networks overriding known ones should take place of known ones in lists(settings and wallet).
• Each item needs to have a per-network toggle to control network visibility in wallet ui.

Desktop issues for reference: #20517, #23207, #23208