[WIP] Add node for creating polycurve from random points

[Copilot]

Implementation Plan for PolyCurve.ByRandomPoints Node

• Explore the repository structure and understand existing patterns
• Create a new PolyCurve.cs file in src/RhythmCore/Geometry directory
• Implement ByRandomPoints method that:
  • Takes number of points as input
  • Generates random points in a bounded area
  • Creates a PolyCurve from those points
• Follow existing code patterns from other Geometry classes
• Verify no compilation errors in the new code
• Run code review
• Run security checks with CodeQL

Original prompt

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This section details on the original issue you should resolve

<issue_title>PolyCurve.ByRandomPoints</issue_title>
<issue_description>What is the problem that needs solving?
Want a node in RhythmCore for creating a polycurve from a random distribution of points. The inputs should be number of points and a random distribution of points is made in the code.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes PolyCurve.ByRandomPoints #84

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