Read config

[richfitz]

Super simple, just read a config. I've added a small example set of data from R that will bootstrap us for a while.

No support yet (or indeed for a while) for writing a config, or initialising a root - this is more similar to the rust support for a bit.

[codecov]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (407c734) 100.00% compared to head (761fa37) 100.00%.

Additional details and impacted files

@@            Coverage Diff            @@
##              main        #1   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            2         4    +2     
  Lines           16        70   +54     
  Branches         2        11    +9     
=========================================
+ Hits            16        70   +54     

Files Changed	Coverage Δ
src/outpack/config.py	100.00% <100.00%> (ø)
tests/test_config.py	100.00% <100.00%> (ø)

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[r-ash]

Code changes look good here, I'd like to get this running on my workstation when I come in later if you can hold off on merge until then? Otherwise I can do it after the fact