Decode BinaryInteger types from Doubles when exactly represented

[swhitty]

Allows any BinaryInteger type to be decoded from a floating point values that do no contain decimal places.

For example, the following now decodes:

// [10, 20, -30]
let values = try KeyValueDecoder().decode([Int].self, from: [10, 20.0, -30.0])

But the following throws an error:

// throws DecodingError.typeMismatch 'Double at SELF[1], cannot be exactly represented by Int'
let values = try KeyValueDecoder().decode([Int].self, from: [10, 20.5, -30.0])

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (91665a2) to head (556379a).

Additional details and impacted files

@@            Coverage Diff            @@
##              main        #7   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         3           
  Lines          605       611    +6     
=========================================
+ Hits           605       611    +6     

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