[orc-rt] Add method-wrapper utils for use with WrapperFunction::handle. (#162035)

WrapperFunction::handleWithAsyncMethod can be used to wrap asynchronous
methods (void methods whose first arguments are Return callbacks) for
use with WrapperFunction::handle.

WrapperFunction::handleWithSyncMethod can be used to wrap regular
(non-asynchronous) methods for use with WrapperFunction::handle.

Both variants return function objects that take a Return callback as
their first argument, and an ExecutorAddr representing the address of
the instance to call the object on. For asynchronous methods the
resulting function object (AsyncMethod<method-ptr>) forwards the Return
callback through to the method. For synchronous methods the method is
called and the result passed to the Return callback.

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