QoL and BugFixes 🚀

Changelog

• Better multi start decoding #102
  • Add modular select_start_nodes function for POMO
  • Improve efficiency of multistart function
  • Add testing and selection function for more envs
  • Fix OP selecting too far away nodes in POMO
  • Automatic multistart, no need to manually choose beforehand when running POMO
• Fix CVRP capacity bug @ngastzepeda #105
• Add critic init embedding support
• Fix data generation and add better docs #106
• Better dataset handling: add dataset choice; use low CPU usage dataset by default
• Better solution plotting and better quickstart notebook #103
• Library winter cleanup
• Miscellaneous minor fixes here and there