feat: support fun router

[czy88840616]

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]

[codecov-io]

Codecov Report

Merging #867 (0a8de8e) into 2.x (d2939f0) will decrease coverage by 0.71%.
The diff coverage is 68.21%.

@@            Coverage Diff             @@
##              2.x     #867      +/-   ##
==========================================
- Coverage   87.32%   86.61%   -0.72%     
==========================================
  Files         179      183       +4     
  Lines        7056     7352     +296     
  Branches     1365     1428      +63     
==========================================
+ Hits         6162     6368     +206     
- Misses        863      944      +81     
- Partials       31       40       +9     

Impacted Files	Coverage Δ
packages/decorator/src/faas/fun.ts	86.66% <ø> (+4.31%)	⬆️
packages/mock/src/utils.ts	72.88% <20.00%> (-2.34%)	⬇️
packages-serverless/serverless-app/src/utils.ts	55.26% <55.26%> (ø)
packages-serverless/serverless-app/src/index.ts	64.88% <64.88%> (ø)
packages/faas/src/framework.ts	82.35% <71.73%> (-5.41%)	⬇️
packages/core/src/util/webRouterCollector.ts	94.31% <85.71%> (+2.76%)	⬆️
packages-serverless/serverless-app/src/platform.ts	100.00% <100.00%> (ø)
packages-serverless/serverless-app/src/start.ts	100.00% <100.00%> (ø)
... and 5 more

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