Unsigned and Signed

[ktbarrett]

Closes #191.

These are useful for implementing a bunch of features currently found in cocotb's LogicArray (e.g. from_unsigned, to_unsigned) that we for binding coconext's DynLogicArray to Python in a way it can sit in place of cocotb's using the patcher.

This just uses uint64_t and int64_t. We will adapt UInt, and SInt from #278 once it's done.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.84%. Comparing base (6a35641) to head (5529b4b).

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #271      +/-   ##
==========================================
+ Coverage   92.76%   92.84%   +0.07%     
==========================================
  Files          23       23              
  Lines        1285     1285              
  Branches      312      312              
==========================================
+ Hits         1192     1193       +1     
  Misses         34       34              
+ Partials       59       58       -1     

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