Structured logging for golang

Taken from apex/log then modify base on my need.

Name		Name	Last commit message	Last commit date
Latest commit History 4 Commits
handlers		handlers
.gitignore		.gitignore
History.md		History.md
LICENSE		LICENSE
Makefile		Makefile
Readme.md		Readme.md
context.go		context.go
context_test.go		context_test.go
default.go		default.go
doc.go		doc.go
entry.go		entry.go
entry_test.go		entry_test.go
go.mod		go.mod
go.sum		go.sum
interface.go		interface.go
levels.go		levels.go
levels_test.go		levels_test.go
logger.go		logger.go
logger_test.go		logger_test.go
pkg.go		pkg.go
pkg_test.go		pkg_test.go
stack.go		stack.go

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