reduce method definitions

[KazuCocoa]

This is a

• Bug report
• Question
• Feature Request

Summary

https://github.com/appium/ruby_lib_core/compare/master...KazuCocoa:reduce-method-definition?expand=1

Environment

• ruby_lib_core version:
• Mobile platform/version/device under test:

Actual behaviour and steps to reproduce

Expected behaviour

Link to Appium/Ruby logs

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Any additional comments

[KazuCocoa]

Can delegate methods for appium driver like.
https://github.com/appium/ruby_lib_core/pull/98/files#diff-87b9d6c4393f676dd96f8168cf1f73d4R557
Define them in appium_lib.