Add implementations of <cmath> for decimal32_fast

[mborland]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.1%. Comparing base (fa54eb5) to head (0bbd605).
Report is 10 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
##           develop    #590     +/-   ##
=========================================
+ Coverage     98.9%   99.1%   +0.2%     
=========================================
  Files          200     201      +1     
  Lines        12912   13291    +379     
  Branches      1487    1512     +25     
=========================================
+ Hits         12766   13166    +400     
+ Misses         146     125     -21     

Files	Coverage Δ
include/boost/decimal/charconv.hpp	95.0% <100.0%> (+0.8%)	⬆️
include/boost/decimal/cmath.hpp	100.0% <100.0%> (ø)
include/boost/decimal/decimal32_fast.hpp	98.6% <100.0%> (+0.6%)	⬆️
include/boost/decimal/detail/cmath/fma.hpp	100.0% <100.0%> (ø)
...lude/boost/decimal/detail/cmath/impl/asin_impl.hpp	100.0% <100.0%> (ø)
...ecimal/detail/cmath/impl/assoc_legendre_lookup.hpp	75.0% <100.0%> (+8.4%)	⬆️
...lude/boost/decimal/detail/cmath/impl/atan_impl.hpp	100.0% <100.0%> (ø)
...clude/boost/decimal/detail/cmath/impl/cos_impl.hpp	66.7% <ø> (ø)
...lude/boost/decimal/detail/cmath/impl/cosh_impl.hpp	100.0% <ø> (ø)
...ude/boost/decimal/detail/cmath/impl/expm1_impl.hpp	100.0% <100.0%> (ø)
... and 22 more

... and 15 files with indirect coverage changes

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