Wrap LIR into an execution classs

[ph]

Tasks for #7291, this is one of the baby step that we want to take to rewrite the pipeline class into java. We will start by wrapping the LIR into an execution class to allow us to achieve the following goals:

• Remove the dynamically created method filter_func and the the conditionals.
• Delete the config_ast class
• Bridge the plugins instances creating into that new Execution class.
• Pipeline.rb will keep the control of the following:
  • managing threads
  • creating the queues

[ph]

cc @original-brownbear

[ph]

As discussed with @original-brownbear we will do the following, we will encapsulate the evaluation of the Ruby code into an execution class and we will expose filter_func/output_func we will create a java interface for that, this will allow us to experiment with Janino or just calling Ruby static methods.