Implement plot functions for pathpyG

[hackl]

• [x] Transfer code from pathpy3
• [x] Modify plot code for pathpyG
  • [x] matplotlib
  • [x] dj3s
  • [x] tikz
• [x] Add plot function for temporal graphs
• [ ] Write and implement test cases
• [x] Document plot function
• [x] Write tutorial for new plot functions
• [x] Merge changes and close issue