906c54faff
This commit adds support for MethodHandles in SpEL, using the same syntax as user-defined functions (which also covers reflective Methods). The most benefit is expected with handles that capture a static method with no arguments, or with fully bound handles (where all the arguments have been bound, including a target instance as first bound argument if necessary). Partially bound MethodHandle should also be supported. A best effort approach is taken to detect varargs as there is no API support to determine if an argument is a vararg or an explicit array, unlike with Method. Argument conversions are also applied. Finally, array repacking is not always necessary with varargs so it is only performed when the vararg is the sole argument to the invoked method. See gh-27099 Closes gh-30045
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