[iOS/Wallet]: Network Settings inside Wallet settings to hide/unhide networks

[nuo-xu]

an iOS version #37397
this needs to be done before #37740

[srirambv]

Verification passed on iPhone 13 with iOS 18.0 Beta running 1.68 (115)

• Verified steps from brave/brave-core#23437
• Verified network settings shows list of all networks
• Verified there is an eye-opened button next to the network indicating its enabled
• Verified clicking on the eye-opened button changes to eye-closed state
• Verified when network icon has eye-closed, network is hidden in filters
• Verified upgrading from older version with Show test network disabled, new version has all test networks disabled
• Verified upgrading from older version with Show test network enabled, new version has all test networks enabled
• Verified able to add a custom network
• Verified custom network has Edit, Delete, Set as default buttons in menu
• Verified every network has Edit and Set as default options
• Verified editing network works as expected
• Verified when a network is disabled but then setting Set as default enables the network

37741-1.MP4	37741-2.MP4	37741-3.MP4