feat: vercel starter and trigger

[echosoar]

Checklist

• npm test passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

Affected core subsystem(s)

Description of change

[gitpod-io]

[echosoar]

ref cli vercel support: midwayjs/cli#165

[codecov-commenter]

Codecov Report

Merging #1199 (9b96fba) into 2.x (17d717b) will increase coverage by 0.08%.
The diff coverage is 90.83%.

@@            Coverage Diff             @@
##              2.x    #1199      +/-   ##
==========================================
+ Coverage   85.20%   85.28%   +0.08%     
==========================================
  Files         232      236       +4     
  Lines        9024     9155     +131     
  Branches     1710     1735      +25     
==========================================
+ Hits         7689     7808     +119     
- Misses       1268     1275       +7     
- Partials       67       72       +5     

Impacted Files	Coverage Δ
packages-serverless/serverless-app/src/platform.ts	100.00% <ø> (ø)
...erverless/serverless-vercel-starter/src/runtime.ts	87.50% <87.50%> (ø)
...-serverless/serverless-vercel-starter/src/index.ts	91.66% <91.66%> (ø)
...s-serverless/serverless-vercel-trigger/src/http.ts	95.65% <95.65%> (ø)
...-serverless/serverless-vercel-trigger/src/index.ts	100.00% <100.00%> (ø)
...kages-serverless/serverless-fc-trigger/src/http.ts	67.39% <0.00%> (ø)

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