[Enhancement] Add **extra_params To POST Router Commands

[deeleeramone]

Relies on this chain: #6250

1. Why?:

   • The purpose is to prevent unexpected keyword argument errors from POST functions, and to facilitate extension development that might require additional parameters that are unknown - visualizations, etc.

2. What?:

   • Add **extra_params to each router function.

   • This should provide the same type of behaviour as provider router functions.

3. Impact (1-2 sentences or a bullet point list):

   • Opens the functions to development/enhancement without needing to modify the router/extension directly.

4. Testing Done:

   • This is blocked by [BugFix] - Untyped variadic keyword arguments break during execution #6250