Pipelines block inputs for Guardrail hooks

Ability to gate and modify inputs / outputs:

Given an input, apply logic around block or allow (provide an interface, single method).
Given an input, add a system message (logic to layer in system message, according to the event nature)

We will use LiteLLM hooks for now, but its a bit messy and should be placed into tech debt.

1 (Given an input, apply logic around block or allow (provide an interface, single method)) is part of PR #91

I will work on 2. after fixing up the provider interfaces (#94)

Jakub will break into two mediums to cover system prompt inclusion.

I broke off the system prompt inclusion into #103

This was done in #91

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