DELTASPIKE-1426: Improve ProxyFactory performance on start

[skybber]

Class.getMethond(name, args) is expensive operation, that is used
intensively on start, when DeltaspikeProxyFactory generates new proxies.
It was used even for checks of public abstract
methods of proxy's base class, but this methods cannot be overridden.
This patch collects all leave methods and skips them in the check.

[skybber]

I've created project with 300 repositories demonstrating this problem:

https://github.com/skybber/expensive-300-ds-repositories

there are 2 flame graphs showing results with not optimized versus optimized code:

https://github.com/skybber/expensive-300-ds-repositories/blob/main/not_optimized_flame_graph.png

https://github.com/skybber/expensive-300-ds-repositories/blob/main/optimized_flame_graph.png

in case of 300 repositories the startup improvement is 2.2s on Ryzen3600 architecture.

[tandraschko]

can you add some unittests, to verify that collectAllMethods still collects all methods from all inhertiance levels?

[skybber]

I'll do that, give me some time for it .

[skybber]

Its not clear for me , what should be correct output in this case:

    public class Class_NonAbstract
    {
        public void test()
        {
        }
    }
    
    public abstract class Class_NonAbstractToAbstract extends Class_NonAbstract
    {
        public abstract void test();
    }

DS currently removes test() method from set of collected methods, sou that output collection does not have neither Class_NonAbstract.test and neither Class_NonAbstractToAbstract.test