F!! feature approval tests flutter to main branch

[yelmuratoff]

F!! feature approval tests flutter to main branch:

• Added new reporter: GitReporter. It allows you to use git to view the differences between the received and approved files.
• Added support to approve files using CLI. Now you can approve files using the command line: dart run approval_tests:review
• Added support to use ApprovalTests during widget tests.
  Thanks to Richard Coutts

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