Experiment with improved Action plugin deriver for FunctionCalls

Problem/Motivation

Our\Drupal\ai\Plugin\AiFunctionCall\Derivative\ActionPluginDeriver is very basic right now, look out how we can improve coverage and reliability.

This task is a place to track experimenting with a more robust solution so we can test effectiveness of context mapper.

Steps to reproduce

Proposed resolution

Remaining tasks

User interface changes

API changes

Data model changes