Make dec32_fast even faster

[mborland]

• Normalizes the value in the constructor rather than at each operation
• Inlines and optimized add, sub, mul, div

@ckormanyos Prior to this PR the benchmarks were showing that decimal32_fast was running in 0.686 of the time that decimal32 was. Now it's down to 0.251.

Closes: #619

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.1%. Comparing base (d49f31b) to head (89d1470).

Additional details and impacted files

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