Improve the API to better match the CCMC manuscript

• Adhere to PEP-621 and change from setuptools+tox to hatch #8 (closed)
• Encapsulate communities (G in the MS) in an object, rather than a JSON file that needs to be read each time #17 (closed). The object needs to have an accessor for each function in the MS
  • limiting
  • exchanged
  • P
  • C
  • scope
• Define feature tests for each of the above #16 (closed)
• Modify the example to better illustrate limiting and exchanged #19 (closed)
• Wrap CoCoMiCo as a CWL Command Line Tool for use in workflows #20 (closed)
• Unit test the above using Planemo #20 (closed)
• Package to source code as an RO Crate #21 (closed)

Since these changes should be backward compatible, according to the rules of semantic versioning we keep the major version and increment the minor version. Thus, this milestone targets version 0.3