Make curves and their fields easier to find

[WiseMrMusa]

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Description

Description of the pull request changes and motivation.

Type of change

I made the short weiestrass curves accessible through the main list of fields

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Checklist

• [x] Linked to Github Issue
• [ ] Unit tests added
• [ ] This change requires new documentation.
  • [ ] Documentation has been added/updated.
• [ ] This change is an Optimization
  • [ ] Benchmarks added/run

Closes #795