Improve and polish the method invoker implementation

WELD-2764 introduced first version of the impl with the following leftover TODOs:

Known TODOs:

• Proper exception handing setup
• Deployment validation of lookups
  • This should also include deployment resolution of lookups and storing them in some form that will speed up repeated resolutions when invoking the method
• Validation of invokable methods during invoker creation
  • After removal of @Invokable we now need to add verification that happens when you attempt to create an invoker for any given method; for instance validate that the method is non-private
• Tests/changes for invokeable methods with generics?
• Remove/Address any leftover TODO comments in the code
• Also look at the benchmarks mentioned in the original PR (https://github.com/weld/core/pull/2864) and review/commit them to the repo
• There is a bunch of Playground_* classes that were used to understand MethodHandles and apply them properly. There are located in test repos but we should revisit whether we want to keep them or remove them.
  • An example of one such class is impl/src/test/java/org/jboss/weld/invokable/Playground_Cleanup.java