Add setBranchKey support and refactor Branch key handling #450
+473
−367
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Introduced setBranchKey method to FlutterBranchSdk for dynamic Branch key assignment, and updated Android and iOS plugins to support this method. Deprecated static Branch key configuration in AndroidManifest.xml and Info.plist in favor of runtime assignment. Refactored and formatted code for improved readability and maintainability, and updated example usage accordingly.