Improve Jobs

[pakoito]

After reading through the Coroutines documentation (https://github.com/Kotlin/kotlinx.coroutines/blob/master/coroutines-guide.md#coroutine-basics) I realised there were a couple of mistakes on our JobW implementation. I've corrected them.

This PR adds more constructors for JobW, fixes Jobs being run twice, and makes the API a bit cleaner. It also fixes MonadErrorLaws to take separate equals for errors and successes.

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@f2fe59d). Click here to learn what that means.
The diff coverage is 47.22%.

@@            Coverage Diff            @@
##             master     #234   +/-   ##
=========================================
  Coverage          ?   49.25%           
  Complexity        ?      231           
=========================================
  Files             ?      108           
  Lines             ?     2410           
  Branches          ?      285           
=========================================
  Hits              ?     1187           
  Misses            ?     1113           
  Partials          ?      110

Impacted Files	Coverage Δ	Complexity Δ
...ain/kotlin/kategory/effects/data/internal/Utils.kt	79.16% <ø> (ø)	0 <0> (?)
...st/src/main/kotlin/kategory/laws/MonadErrorLaws.kt	9.09% <0%> (ø)	1 <0> (?)
...ts-test/src/main/kotlin/kategory/laws/AsyncLaws.kt	2.08% <0%> (ø)	1 <0> (?)
...cts/src/main/kotlin/kategory/effects/data/JobKW.kt	43.39% <43.39%> (ø)	3 <3> (?)
...ffects/src/main/kotlin/kategory/effects/data/IO.kt	72.44% <83.33%> (ø)	10 <0> (?)
...otlin/kategory/effects/instances/JobKWInstances.kt	85.71% <85.71%> (ø)	0 <0> (?)

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