Use bump2version for KGTK release versioning

[dangiankit]

Is your feature request related to a problem? Please describe. An enhancement to versioning in KGTK releases in place of __version__ in init.py.

Describe the solution you'd like Use bump2version (a maintained fork of bumpversion) to simplify releasing software by updating all version strings in KGTK by the correct increment. It helps improve streamline releases and readability by defining a .bumpversion.cfg file.

Describe alternatives you've considered Here's a list of alternatives from bump2version's repo.

Additional context None.