Geometry_Engine: Add join mesh method and fix MergeVertices

[IsakNaslundBh]

Issues addressed by this PR

Closes #2945
Closes #2946

• Adding method for joining multiple meshes into single mesh. Allows for (does not check for) if the meshes are disjointed or not.
• Fix the non-functioning MergedVertices method and rename it MergeVertices (removing the d). Complete rewrite as the previous version was not functioning, and we now have access to better grouping functionality through the domain tree clusters.

Test files

https://burohappold.sharepoint.com/:f:/s/BHoM/Eo4Nblb9345DlWdrFSNZwx8BwNsgwKB74BxCuqah5qCYPg?e=Hmavj2

Changelog

Additional comments

[IsakNaslundBh]

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[pawelbaran]

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[pawelbaran]

Approving based on the code review, answered comments as well as testing made using provided test file as well as in promptu performance tests, which showed there is still space for improvement in finding duplicate points (but this refers to BHoM cull duplicate methods in general).

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