feat: add getText enhancement for complex text widgets

[tandt53]

hi there,

Recently I encountered a problem when getting text from Text widget. Then I tried to fix it by revise code in https://github.com/Alpaca00/command-driven-list, and it worked.

• I described my issue and simple solution to fix it here Solving getText Issues with Appium Flutter Driver: A Complete Guide.
• I also found a similar issue in issue#585.

Thus, I decided to implement a new command getTextWithCommandExtension that is similar with dragAndDropWithCommandExtension. It works on my local.

Please refer to my flutter code here and attached video for my demo.

demo.mp4

[linux-foundation-easycla]

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• ✅ login: tandt53 / name: tan (c61a2b5, b139031, f63731e, f219fa4)