Add MSVC 14.5 runner

[mborland]

No description provided.

[mborland]

Over alignment was the cause of our decimal type issues. Will have to dig into big uints on Monday. I believe that I have forced over alignment with u256.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.4%. Comparing base (713f015) to head (ca62dce).

Additional details and impacted files

@@           Coverage Diff           @@
##           develop   #1391   +/-   ##
=======================================
  Coverage     98.4%   98.4%           
=======================================
  Files          288     288           
  Lines        22972   22972           
  Branches      1997    1997           
=======================================
  Hits         22604   22604           
  Misses         368     368           

Files with missing lines	Coverage Δ
include/boost/decimal/decimal_fast128_t.hpp	96.0% <ø> (ø)
include/boost/decimal/decimal_fast64_t.hpp	97.5% <ø> (ø)
include/boost/decimal/detail/u256.hpp	82.5% <ø> (ø)

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