set up dynamic versioning

[7RedViolin]

Changes

• Update pyproject.toml to use poetry's dynamic versioning
• Update release.yml
  • Release to PyPi only occurs on tags (to avoid duplicate runs)
  • Add additional checks to verify tags exist, branch is clean, and tags are unique and not previously used
• Update init.py to use dynamic versioning
• Update readme.md with new contributor
• Update test.yml to remove duplicate runs and restrict trigger to only branch pushes