Allow target to be mocked in sendEvent

[kitsonk]

Type: feature

The following has been addressed in the PR:

• There is a related issue
• All code matches the style guide
• Unit or Functional tests are included in the PR

Description:

This PR adds the ability to supply target as part of the eventInit of sendEvent for use cases where there is a need for a mock of the target when dispatching an event on the real target.

Resolves #12

[codecov]

Codecov Report

Merging #13 into master will decrease coverage by 1.59%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master      #13     +/-   ##
=========================================
- Coverage   98.57%   96.97%   -1.6%     
=========================================
  Files           8        8             
  Lines         560      562      +2     
  Branches      126      127      +1     
=========================================
- Hits          552      545      -7     
- Misses          4        9      +5     
- Partials        4        8      +4

Impacted Files	Coverage Δ
src/support/sendEvent.ts	100% <100%> (ø)	⬆️
src/support/assertRender.ts	91.42% <0%> (-8.58%)	⬇️
src/harness.ts	95.5% <0%> (-3%)	⬇️

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[kitsonk]

Right now, the use case that was driving this has gone away, so it doesn't make sense to address this until we have a valid use case. Closing for now.