Revamp jdk.jpackage.internal.util.function package

[alexeysemenyukoracle]

• Add exception type as an additional generic parameter to all Throwing... interfaces
• Add unit tests
• Add ExceptionBox.toUnchecked(). It is equivalent to ExceptionBox.rethrowUnchecked(), but doesn't throw
• Replace ExceptionBox.rethrowUnchecked(...) with ExceptionBox.toUnchecked(...); this increased test coverage of "jdk.jpackage.internal.util.function" package from 86% to 97%
• Change exception handling in ExceptionBox.toUnchecked() (former ExceptionBox.rethrowUnchecked()):
  • InterruptedException: instead of rethrowing an exception of this type, it calls Thread.currentThread().interrupt() and then rethrows it
• Add ExceptionBox.unbox() (former TKit.unbox()). It is complementary to ExceptionBox.toUnchecked()
• Catch Exception instead of Throwable where appropriate to avoid catching Error-s. The idea is not to handle fatal errors
• Replace vague throws Throwable exception specifications with more specific ones where appropriate

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