Extract common implementations of Eq

[pakoito]

Closes #121

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@1f1b1cc). Click here to learn what that means.
The diff coverage is 66.66%.

@@            Coverage Diff            @@
##             master     #125   +/-   ##
=========================================
  Coverage          ?   55.27%           
  Complexity        ?      215           
=========================================
  Files             ?       90           
  Lines             ?     1328           
  Branches          ?      179           
=========================================
  Hits              ?      734           
  Misses            ?      520           
  Partials          ?       74

Impacted Files	Coverage Δ	Complexity Δ
...ategory/src/main/kotlin/kategory/typeclasses/Eq.kt	66.66% <100%> (ø)	0 <0> (?)
...egory/src/main/kotlin/kategory/instances/EvalEq.kt	50% <50%> (ø)	1 <1> (?)
...ategory/src/main/kotlin/kategory/instances/IOEq.kt	50% <50%> (ø)	1 <1> (?)
.../src/main/kotlin/kategory/instances/Function0Eq.kt	50% <50%> (ø)	1 <1> (?)
...egory/src/main/kotlin/kategory/instances/FreeEq.kt	75% <75%> (ø)	1 <1> (?)

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