Support type loose for multipleOf validator

[justin-tay]

Closes #917, closes #893

This adds support for type loose configuration for the multipleOf validator.

[codecov-commenter]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (2795d79) 78.85% compared to head (3cb9596) 78.81%.

Files	Patch %	Lines
...java/com/networknt/schema/MultipleOfValidator.java	61.11%	1 Missing and 6 partials ⚠️

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Additional details and impacted files

@@             Coverage Diff              @@
##             master     #945      +/-   ##
============================================
- Coverage     78.85%   78.81%   -0.05%     
- Complexity     1690     1694       +4     
============================================
  Files           157      157              
  Lines          5661     5669       +8     
  Branches       1068     1071       +3     
============================================
+ Hits           4464     4468       +4     
- Misses          798      799       +1     
- Partials        399      402       +3     

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