Read thickness fix

[johannaisak]

Handles if thickness is written as number or number(unit) for both GSA10.1 and GSA 8.7

NOTE: Depends on

Issues addressed by this PR

Closes #285

Test files

https://burohappold.sharepoint.com/:f:/r/sites/BHoM/02_Current/12_Scripts/02_Pull%20Request/BHoM/GSA_Toolkit/%23286-Pull-FE-meshes-in-GSA101?csf=1&web=1&e=YH3NIy

Changelog

Additional comments

[TosteSkDa]

Tested for both GSA8.7 and 10.1. Pull works perfectly. Checked pulled output from GSA and thickness matches. Code looks good.

[FraserGreenroyd]

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[Chrisshort92]

@FraserGreenroyd can you merge this PR please?