Separate sample and project management into child classes.

[donaldcampbelljr]

Work for separating sample and project management into child classes.

Also add pipestatboss as a wrapper to hold these child classes.

[codecov]

Codecov Report

Merging #79 (2f1cc27) into dev (8f6b3b4) will decrease coverage by 0.53%.
The diff coverage is 93.41%.

@@            Coverage Diff             @@
##              dev      #79      +/-   ##
==========================================
- Coverage   88.94%   88.42%   -0.53%     
==========================================
  Files          17       17              
  Lines        2434     2428       -6     
==========================================
- Hits         2165     2147      -18     
- Misses        269      281      +12     

Files Changed	Coverage Δ
pipestat/pipestat.py	84.61% <85.96%> (-2.20%)	⬇️
pipestat/parsed_schema.py	84.69% <90.00%> (-3.58%)	⬇️
pipestat/backends/dbbackend.py	87.54% <90.69%> (+0.75%)	⬆️
pipestat/backends/filebackend.py	88.57% <91.42%> (-0.32%)	⬇️
tests/test_pipestat.py	96.97% <96.49%> (-0.81%)	⬇️
pipestat/backends/abstract.py	64.70% <100.00%> (-0.68%)	⬇️
pipestat/const.py	100.00% <100.00%> (ø)
pipestat/helpers.py	85.93% <100.00%> (ø)
pipestat/reports.py	81.40% <100.00%> (-0.44%)	⬇️
tests/test_db_only_mode.py	91.26% <100.00%> (ø)
... and 2 more

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