Initial implementation of NCHG cartesian-product

[robomics]

The purpose of this command is to take a list of 1D domains in BED3+ format, and generate a list of pairs of domains suitable for NCHG compute.

[codecov]

Codecov Report

Attention: Patch coverage is 69.67213% with 222 lines in your changes missing coverage. Please review.

Project coverage is 74.08%. Comparing base (0ca970b) to head (098f3e3).
Report is 21 commits behind head on main.

Files with missing lines	Patch %	Lines
src/nchg/compute/compute.cpp	63.38%	94 Missing and 25 partials ⚠️
src/nchg/cartesian_product/cartesian_product.cpp	70.03%	68 Missing and 21 partials ⚠️
src/nchg/cli.cpp	88.63%	6 Missing and 4 partials ⚠️
src/nchg/common/io_impl.hpp	69.23%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
- Coverage   74.32%   74.08%   -0.24%     
==========================================
  Files          32       34       +2     
  Lines        4296     4924     +628     
  Branches      445      531      +86     
==========================================
+ Hits         3193     3648     +455     
- Misses        850      985     +135     
- Partials      253      291      +38     

Flag	Coverage Δ
[tests	integration](https://app.codecov.io/gh/paulsengroup/NCHG/pull/43/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=paulsengroup)	71.83% <69.67%> (+0.09%)
[tests	unittests](https://app.codecov.io/gh/paulsengroup/NCHG/pull/43/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=paulsengroup)	68.28% <ø> (ø)

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