feat: support debug by MIDWAY_FAAS_DEBUG

[echosoar]

在任何dev-pack等使用invoke的地方都可以通过 MIDWAY_FAAS_DEBUG = true 环境变量来开启函数debug模式

[gitpod-io]

[codecov-io]

Codecov Report

Merging #165 into master will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #165      +/-   ##
==========================================
+ Coverage   79.78%   79.80%   +0.02%     
==========================================
  Files          86       86              
  Lines        3299     3303       +4     
  Branches      405      405              
==========================================
+ Hits         2632     2636       +4     
  Misses        661      661              
  Partials        6        6              

Impacted Files	Coverage Δ
packages/faas-cli-plugin-invoke/src/invoke.ts	93.33% <100.00%> (+1.02%)	⬆️

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