[log] Refactor and measure performance using benchmark

[at15]

Trying to fix all those issues https://github.com/dyweb/gommon/issues?q=is%3Aopen+is%3Aissue+label%3Apkg%2Flog

Will first write the doc and list some changes in design, which could be the base of the long pending blog https://github.com/dyweb/blog/issues/28

TODO

Fixed

• [x] http util unix domain socket, docker proxy etc. #93
• [x] test util dump pretty json and pretty yaml #92
• [x] first class support for fields #79
• [x] multi handler #87
• [x] tree of logger problem #33 #78
• [x] performance #88

[codecov[bot]]

Codecov Report

Merging #90 into master will increase coverage by 0.06%. The diff coverage is 30.29%.

@@            Coverage Diff             @@
##           master      #90      +/-   ##
==========================================
+ Coverage   48.16%   48.22%   +0.06%     
==========================================
  Files          52       56       +4     
  Lines        1796     2030     +234     
==========================================
+ Hits          865      979     +114     
- Misses        847      956     +109     
- Partials       84       95      +11

Impacted Files	Coverage Δ
util/cast/cast.go	61.9% <ø> (ø)	:arrow_up:
log/generator.go	66.66% <ø> (ø)	:arrow_up:
generator/generate.go	0% <ø> (ø)	:arrow_up:
generator/shell.go	0% <ø> (ø)	:arrow_up:
generator/pkg.go	0% <ø> (ø)	:arrow_up:
util/httputil/unix.go	0% <0%> (ø)
log/handlers/cli/handler.go	20% <0%> (+4.81%)	:arrow_up:
util/testutil/http.go	0% <0%> (ø)	:arrow_up:
log/field.go	75% <100%> (+75%)	:arrow_up:
util/runtimeutil/caller.go	92% <100%> (ø)	:arrow_up:
... and 20 more

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