Update project to use pyproject.toml

[RommelLayco]

This is to ensure that the project meets the standard packing guidelines in PEP-0621, and that the version of the package meets PEP-440

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.90%. Comparing base (7a4b1ae) to head (ed10795).

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #194       +/-   ##
===========================================
- Coverage   89.10%   78.90%   -10.21%     
===========================================
  Files         144      142        -2     
  Lines       10216    10173       -43     
===========================================
- Hits         9103     8027     -1076     
- Misses       1113     2146     +1033     

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[alanfranz]

@RommelLayco automagic version setting for this doesn't seem to work without a .git directory (which is what we're using when build the package in aiven-core). Also, is there any way to manually set the version from "outside" at build time?

And, it seems the gh action was updated but there's no Makefile target to actually create the astacus version.