Feature/json-interator (faster json de/encoder)

[Dexus]

• Please check if the PR fulfills these requirements

• The commit message follows our guidelines. See Contributing guide

• Tests for the changes have been added (for bug fixes / features)

• Docs have been added / updated (for bug fixes / features)

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...) feature

• What is the current behavior? (You can also link to an open issue here)

  24

• What is the new behavior (if this is a feature change)? faster json en/decoder

• Does this PR introduce a breaking change? (What changes might users need to make in their application due to this PR?) none

• Other information:

close #24

[codecov[bot]]

Codecov Report

Merging #49 into devel will increase coverage by 0.38%. The diff coverage is n/a.

@@            Coverage Diff             @@
##            devel      #49      +/-   ##
==========================================
+ Coverage   47.35%   47.74%   +0.38%     
==========================================
  Files          22       22              
  Lines         963     1240     +277     
==========================================
+ Hits          456      592     +136     
- Misses        475      616     +141     
  Partials       32       32

Impacted Files	Coverage Δ
core/handlerconv/from_std.go	66.12% <0%> (-10.54%)	:arrow_down:
core/host/proxy.go	73.8% <0%> (-3.34%)	:arrow_down:
core/host/scheduler.go	51.47% <0%> (-2.77%)	:arrow_down:
core/router/macro/macro.go	26.54% <0%> (-1.12%)	:arrow_down:
core/router/macro/interpreter/lexer/lexer.go	75.42% <0%> (-0.87%)	:arrow_down:
core/host/task.go	43.9% <0%> (-0.22%)	:arrow_down:
core/logger/dev.go	0% <0%> (ø)	:arrow_up:
core/router/macro/template.go	0% <0%> (ø)	:arrow_up:
core/host/task_banner.go	0% <0%> (ø)	:arrow_up:
core/nettools/server.go	0% <0%> (ø)	:arrow_up:
... and 8 more

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