add working memory for the agent prompt prefix and suffix hook

[AlboCode]

Description

Add working memory to prompt flow suffix and prefix hooks

Related to issue #(issue)

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas

[pieroit]

@AlboCode after sessions are introduced you will find the correct working memory (user/session specific) in cat.working_memory

We need a little more time!

Also we cannot change hooks so easily, many plugins rely on that signature