Add tool to simplify geometries

[Notgnoshi]

• geom2graph round trip
  • Merge duplicate lines
  • Merge overlaps
  • How to deal with unwanted dangles?
  • Maybe: 1) snap, 2) create the graph, 3) add graph nodes to a K-d tree, 4) for each geometry, look up each vertex in the K-d tree, drop if not found?
• snap together nearby vertices
• DP simplification via https://docs.rs/geo/latest/geo/algorithm/simplify/trait.Simplify.html or https://docs.rs/geo/latest/geo/algorithm/simplify_vw/trait.SimplifyVw.html
• Join end-to-end segments to form a single LINESTRING
  • Take polygonization dangles, form a graph, and traverse

How to handle error tolerance?

This may work best if it consumes the graph output from #62?

[Notgnoshi]

Related to

• https://github.com/Notgnoshi/generative/issues/87
• https://github.com/Notgnoshi/generative/issues/136
• https://github.com/Notgnoshi/generative/issues/130
• https://github.com/Notgnoshi/generative/issues/145