read_surface does not support FreeSurfer surface files (.pial, .orig)

[hasibagen]

What is the current behavior?

When trying to load FreeSurfer surface files (.pial, .orig) using read_surface(), I get the following error:

TypeError: Unknown input type 'pial'.
However, when using .gii files converted from FreeSurfer surfaces, the function works correctly.

Please provide the steps to reproduce and if possible a minimal demo of the problem

This code works fine when using .gii files:

from brainspace.mesh.mesh_io import read_surface
from nilearn import surface

right_surf = surface.load_surf_mesh('/surf/rh.pial.3T_head.gii')
rh = read_surface('/surf/rh.pial.3T_head.gii')

p = Plot(rh, size=(400, 200), zoom=1.3)
p.add_layer(vertex_values, cbar=True, cmap='coolwarm', color_range=(-max_abs, max_abs))
p.build(figsize=(10, 8), scale=(4, 4))

However, when using FreeSurfer's native .pial file, the following code fails:

right_surf = surface.load_surf_mesh('/surf/rh.pial')
rh = read_surface('/surf/rh.pial')  
# Error occurs here

What is the expected behavior?

I expect read_surface() to support FreeSurfer's native surface files (.pial, .orig) without conversion, similar to how .gii files are handled.

Please tell us about your computing environment:
BrainSpace Version: 0.1.20
Python Version: 3.9.6 (default, Aug 18 2021, 19:38:01)
Operating System: Ubuntu 22.04
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