Sync RBS type signatures with current codebase

[Copilot]

The RBS type signature files in sig/ were out of sync with the Ruby source files in lib/, with stale signatures for removed code and missing signatures for existing modules.

Changes

• Removed sig/lib/appium_lib_core/android/device/network.rbs - Ruby file was deleted but RBS remained
• Relocated sig/lib/appium_lib_core/ios/clipboard.rbs → sig/lib/appium_lib_core/ios/device/clipboard.rbs to match actual Ruby file path and removed obsolete method signatures
• Added sig/lib/appium_lib_core/android/uiautomator2/device.rbs for existing module

All 66 RBS files now correspond 1:1 with Ruby source files containing module/class definitions. Files with only require statements correctly have no RBS counterparts.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Update RBS with the latest code</issue_title>
<issue_description>Update sig in https://github.com/appium/ruby_lib_core/tree/master/sig with the latest code basis such as #571.

Then, please add missing rbs files for the existing code in https://github.com/appium/ruby_lib_core/tree/master/lib</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Update RBS with the latest code #643

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