Support for creating AOP proxies at Runtime if necessary

[dstepanov]

When annotating with @RuntimeProxy(MyCreator.class) we will not generate a proxy class that intercept the bean, instead we allow for the proxy to be created at the runtime.
Use-cases:

• proxy implemented using bytebuddy - test included
• proxy implemented using Java Proxy reflection - only for interfaces - test include
• Mockito mock / spy proxies

In this case we will generate only the bean definition without a proxy implementation:

    public Object instantiate(BeanResolutionContext resolutionContext, BeanContext context) {
        return ((ByteBuddyRuntimeProxy)resolutionContext.getBean(ByteBuddyRuntimeProxy.class)).createProxy(DefaultRuntimeProxyDefinition.introduction(resolutionContext, this));
    }

[sdelamo]

@dstepanov Can you provide a PR description that describes why we need this PR?

[graemerocher]

if I don't need proxying how would I return the original bean?

[dstepanov]

Nothing is created at this moment, so you instantiate it yourself with the constructor values provided or if it's the target proxy you have to get it from the proxy definition

[dstepanov]

To explain it a bit more, we have two ways of generating a proxy; with a proxy target or without.
With a proxy target we get the target bean instance from the bean context, and delegate the non-intercepted call to it. In a case of a no-proxy-target we simply extend the class and create an extra methods that do the super-call.
If you don't want to override the class at the runtime, you will need to add @Around(proxyTarget=true)

[graemerocher]

could we have something in this annotation that activates @Around(proxyTarget=true) behaviour

[dstepanov]

I can add proxyTarget to it

[dstepanov]

Added

[graemerocher]

would be good to add a test Groovy implementation that returns the original instance and uses runtime Groovy meta-programming to replace the method and proxy instead. This will further validate what we are trying to achieve. See https://groovy-lang.org/metaprogramming.html#metaprogramming_emc

[dstepanov]

Added

[sonarqubecloud]

Quality Gate failed

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61.4% Coverage on New Code (required ≥ 70%)
2 New Bugs (required ≤ 0)

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