fix: type hints for meshing workflows

[Gobot1234]

Context

Fixes #4772 by adding intellisense for the meshing classes by making their proxying behaviour typed.

Change Summary

Adds types and tests for the meshing workflows

Impact

No user noticeable runtime changes only changed class names to stop interfering with type checking, added tests and a couple imports

NB I've intentionally picked the base to be my branch to make changes easier to review, should be merged onto main once the base is merged.

[Gobot1234]

Not sure if something similar can be done for the old workflow I imagine that's nightmarish to try and type all the TypedDicts for arguments. At least attribute access should be fully typed

[Gobot1234]

Small update had a chat with Prithwish and realised this is missing

workflow.task_object.create_surface_mesh.cfd_surface_mesh_controls(  
                                      # ^^^^^^^^^^^^^^^^^^^^^^^^^ this shouldn't be Unknown but is
    curvature_normal_angle=12,
    growth_rate=1.15,
    max_size=50,
    min_size=1,
    size_functions="Curvature"
)