[WIP] Airspec launcher

[xerial]

Create a standalone launcher for AirSpec

[codecov]

Codecov Report

Merging #685 into master will decrease coverage by <.01%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #685      +/-   ##
==========================================
- Coverage   83.24%   83.24%   -0.01%     
==========================================
  Files         230      231       +1     
  Lines        8754     8753       -1     
  Branches      636      646      +10     
==========================================
- Hits         7287     7286       -1     
  Misses       1467     1467

Impacted Files	Coverage Δ
airspec/src/main/scala/wvlet/airspec/AirSpec.scala	93.33% <ø> (ø)	⬆️
.../main/scala/wvlet/airspec/runner/AirSpecTask.scala	100% <ø> (ø)	⬆️
...scala/wvlet/airspec/runner/AirSpecTaskRunner.scala	85.45% <ø> (ø)	⬆️
airspec/src/main/scala/wvlet/airspec/package.scala	100% <ø> (ø)	⬆️
...ain/scala/wvlet/airspec/runner/AirSpecLogger.scala	73.33% <ø> (+1.45%)	⬆️
...pec/src/main/scala/wvlet/airspec/AirSpecMain.scala	0% <0%> (ø)
.../scala/wvlet/airspec/runner/AirSpecRunnerSbt.scala	62.5% <100%> (ø)
...rspec/src/main/scala/wvlet/airspec/Framework.scala	80% <100%> (ø)	⬆️

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[xerial]

We need to redo this work as we added new test syntax #876