Umbrella/tracking issue for ongoing work on #124252.

• Move java logic to its own file
  • [tool] Move Java functions to their own file #126086
• Migrate other classes away from depending on AndroidSdk only for its .java* APIs.
  • [tool] Move Java functions to their own file #126086
• Make all classes use the same means to locate java and set JAVA_HOME/PATH when running java-dependent tools.
  • [tools] use Java class for all java-searching behavior #127354

Related:

• [tool] In flutter doctor -v, warn when Android Studio version could not be detected. #126395
• [tools] Apply Android Studio version detection logic to explicitly configured installation directory (flutter config --android-studio-dir) #125596
• [tools] allow explicitly specifying the JDK to use via a new config setting #128264
• When searching for the JDK bundled with an unrecognized version of Android Studio, assume the version to be the latest #125247
• add test for setting JAVA_HOME and PATH when invoking sdkmanager --licenses #127344
• [flutter_tools] Reorganize android_studio_test.dart #124834
• [tools] Apply Android Studio version detection logic to explicitly configured installation directory (flutter config --android-studio-dir) #125596
• [flutter_tools] ProcessPackageException in Java.version #139180