Pass form as second argument to action callbacks

[nhunzaker]

Right now it's hard to reset a form when an action completes. This commit adds the form as the second argument of these callbacks, making this easier:

class MyForm extends React.Component {
  onDone(_payload, form) { 
    form.reset()
  }

  render() {
    return (
      <ActionForm action="doSomething" onDone={this.onDone}>
        ...
      </ActionForm>
    )
  }
}

Fixes: https://github.com/vigetlabs/microcosm/issues/424

[codecov-io]

Codecov Report

Merging #431 into master will increase coverage by 3.9%. The diff coverage is 97.29%.

@@            Coverage Diff            @@
##           master     #431     +/-   ##
=========================================
+ Coverage   84.19%   88.09%   +3.9%     
=========================================
  Files          44       44             
  Lines        1303     1310      +7     
  Branches      241      239      -2     
=========================================
+ Hits         1097     1154     +57     
+ Misses        173      131     -42     
+ Partials       33       25      -8

Impacted Files	Coverage Δ
packages/microcosm/src/microcosm.js	100% <100%> (ø)	:arrow_up:
packages/microcosm/src/coroutine.js	100% <100%> (ø)	:arrow_up:
packages/microcosm-preact/src/action-form.js	100% <100%> (ø)	:arrow_up:
packages/microcosm-preact/src/action-button.js	100% <100%> (ø)	:arrow_up:
packages/microcosm/src/addons/action-form.js	97.5% <93.33%> (+97.5%)	:arrow_up:
packages/microcosm/src/action.js	100% <0%> (+9.09%)	:arrow_up:

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[efatsi]

👍