fix: Correctly handle min and max bounds less than 1 for Decimal

[Jesse (jhall-bp)]

Motivation

Issue: #130

dy.Decimal currently crashes during validation when instantiated with a min or max value that is 0 or less. This PR changes the way that the number of digits before the decimal place of a decimal.Decimal is calculated so that smaller mix/max values can be used as constraints.

Changes

• The _num_digits helper function used for validating dy.Decimal inputs has been changed to use the digits and exponent values from decimal.Decimal.as_tuple() to calculate the number of digits instead of using math.log10
• Update test cases for dy.Decimal

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (d8916e8) to head (a54be69).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #131   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           42        42           
  Lines         2450      2451    +1     
=========================================
+ Hits          2450      2451    +1     

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[Oliver Borchert (borchero)]

LGTM, thank you!