switch to pyproject style package

[eacharles]

Added pyproject.toml, moved code to src directory

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (2a88d6a) compared to base (fbd3c80).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff            @@
##              main       #52   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            8         8           
  Lines          605       603    -2     
=========================================
- Hits           605       603    -2     

Flag	Coverage Δ
unittests	100.00% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/tables_io/__init__.py	100.00% <ø> (ø)
src/tables_io/arrayUtils.py	100.00% <ø> (ø)
src/tables_io/convUtils.py	100.00% <ø> (ø)
src/tables_io/ioUtils.py	100.00% <ø> (ø)
src/tables_io/lazy_modules.py	100.00% <ø> (ø)
src/tables_io/tableDict.py	100.00% <ø> (ø)
src/tables_io/testUtils.py	100.00% <ø> (ø)
src/tables_io/types.py	100.00% <ø> (ø)

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