[ENH] Add HCPex atlas from Huang et al. 2022 (MT vs MST)

[JeanneCaronGuyon]

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New feature

Add the HCPex atlas from Huang et al. 2022

• Paper : https://www.oxcns.org/papers/645%20Huang%20Rolls%20et%20al%202022%20An%20Extended%20Human%20Connectome%20Project%20Atlas.pdf
• Atlas on Github : https://github.com/wayalan/HCPex

Especially interesting as it divides MT and MST !

nb: they already implemented the use of aal3 within SPM to label activation clusters with this atlas. Might be interesting for further dev of automatic labelling.

Unclear documentation

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