Feat/add triangulate 2dz

Add new aglo

Algo name

triangulate_2dz

To-do list

Processing

• Add new processing file in qsfcgal/processing/triangulate_2dz.py
• Adding the new algorithm to loadAlgorythms() method in the provider.py file

Expression

• Add the new expression file to qsfcgal/expression and name it cg_triangulate_2dz.py
• Document expression in code for display in QGIS calculator
• Add the import of the new expression to plugin_main.py (init and unload)

Tests

• Add a test file for processing in tests/qgis/processing and name it test_triangulate_2dz.py
• Add a test file for expression in tests/qgis/expression and name it test_cg_triangulate_2dz.py

Documentation

• Create a triangulate_2dz.md file in docs/QSFCGAL and write the doc in it.
• Illustrate the algo with an image filed in docs/img and named triangulate_2dz.png then insert this image in docs/QSFCGAL/triangulate_2dz.md
• Update in docs /QSFCGAL/algorithm.md
• Add new documentation page to docs/index.md
• Update readme.md with the new algo

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Author's checklist

• I've read the contribution guidelines and affirm:
  • my branch has been created from main
  • if the code is not completely achieved, I apply the Draft/WIP prefix
  • the DOD is satisfied specially tests
• assign myself (the MR creator will automatically be assigned)
• the box Delete source branch when merge request is accepted. is checked

Reviewer's checklist

• assign yourself as Reviewer and remember that others developers can comment too