Populate MethodInvocation to RetryPolicy (via RetryContext)

[ttddyy]

I would like to get MethodInvocation in RetryPolicy(probably via RetryContext) when available(invoked with MethodInvocationRetryCallback); so that, the policy can dynamically determine whether to retry based on the invoked method.

Since 1.3, MethodInvocationRetryCallback exposes MethodInvocation but it is only available to RetryListener.
The RetryListener#open could use this MethodInvocation; however, returning false here ends up TerminatedRetryException. So, this cannot be used to determine retry based on the invoked method.

My usecase is that I am writing a retry interceptor(MethodInterceptor) for transaction retry. It determines the retry based on the invoked method(TransactionDefinition applied on the invoked method/class).
Currently, in order to get invoked method, I apply ExposeInvocationInterceptor from spring to where spring advises for transactions. Then, my RetryPolicy retrieves the invoked method from ThreadLocal stashed by the ExposeInvocationInterceptor.

If MethodInvocation is available in RetryContext of RetryPolicy, I can directly acquire the invoked method and ExposeInvocationInterceptor is no longer required.

[dsyer]

I guess it would be good to look at the change, and see some tests. Anyone feel like sending a PR?