[Agent] Introduce policies #1572
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This PR aims to introduce the support for "policies" at the
Agentlevel, Policies are a way to enable/disable features in agents (think of it like stamps onMessengermessages` or "feature-flags").This PR is an extension of a discussion with @chr-hertel last week about the refactoring of
Agent, the main goal is to allow adding new features depending on the configuration of an agent and the enabled policies (for example, we might want to enableSpeechPolicyto add the support for Speech as implemented in #943, it can also help the introduction ofEvaluatorlater and many more).For now, the
DelayPolicyis added to show how the code is added into the component, the goal of this policy is to add a delay before/after sending/receiving the input/output.PS: The code is decoupled from input/outputs processors.