feat: support koa application

[czy88840616]

No description provided.

[gitpod-io]

[Lellansin]

Awesome

[codecov-io]

Codecov Report

Merging #162 into master will decrease coverage by 0.65%.
The diff coverage is 64.40%.

@@            Coverage Diff             @@
##           master     #162      +/-   ##
==========================================
- Coverage   80.35%   79.70%   -0.66%     
==========================================
  Files          85       86       +1     
  Lines        3192     3281      +89     
  Branches      367      401      +34     
==========================================
+ Hits         2565     2615      +50     
- Misses        621      660      +39     
  Partials        6        6              

Impacted Files	Coverage Δ
packages/faas/src/index.ts	100.00% <ø> (ø)
packages/serverless-spec-builder/src/wrapper.ts	86.11% <ø> (ø)
packages/serverless-http-parser/src/context.ts	74.19% <29.41%> (-10.81%)	⬇️
packages/faas/src/starter.ts	75.91% <44.44%> (-2.55%)	⬇️
packages/serverless-fc-starter/src/runtime.ts	78.75% <66.66%> (-6.78%)	⬇️
packages/serverless-http-parser/src/application.ts	67.50% <67.50%> (ø)
packages/serverless-scf-starter/src/runtime.ts	88.67% <91.89%> (-2.99%)	⬇️
packages/faas/src/configuration.ts	100.00% <100.00%> (ø)
packages/gateway-common-core/src/index.ts	100.00% <0.00%> (ø)
packages/faas-cli-command-core/src/index.ts	100.00% <0.00%> (ø)
... and 3 more

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