[Platform] Decouple Token Processors from Agent component

[chr-hertel]

Currently the Platform component has dependencies to the Agent component - which is wrong from an architecture point of view, since the Platform component is the lower level component, and the dependency should be uni-directional from Agent to Platform.

Besides #519 there is also the dependency from out current token output solution in Platform to Agent because it is using the OutputProcessorInterface extension point.

Does the Platform component need a similar extension point?
Potentially should be aligned with implementation of #519

[VincentLanglet]

Couldn't this be resolved by #480 ?
Currently I think the agent dependency is only in the bridges.

We could have

• Platform
• Agent which depends on Platform
• Bridges which depends on both

[stof]

If platform bridges are meant to provide the vendor-specific implementation of the platform, it has to be considered in the same architectural layer than the platform itself, and so should not depend on Agent either.
The question is whether a project can meaningfully use Platform without using Agent.