improve package glog; fix issue in package gtrace

[gqcn]

1. add interface ILogger for package glog
2. fix issue in nil context returned for gtrace.WithTraceID if given traceID is invalid

[codecov-commenter]

Codecov Report

Merging #1952 (4fc230a) into master (d7faae0) will increase coverage by 0.02%.
The diff coverage is 62.96%.

@@            Coverage Diff             @@
##           master    #1952      +/-   ##
==========================================
+ Coverage   75.56%   75.58%   +0.02%     
==========================================
  Files         512      512              
  Lines       46398    46403       +5     
==========================================
+ Hits        35060    35075      +15     
+ Misses       9334     9325       -9     
+ Partials     2004     2003       -1     

Flag	Coverage Δ
go-1.15-386	75.46% <62.96%> (-0.04%)	⬇️
go-1.15-amd64	75.48% <62.96%> (+0.01%)	⬆️
go-1.16-386	75.48% <62.96%> (+0.03%)	⬆️
go-1.16-amd64	75.49% <62.96%> (+0.01%)	⬆️
go-1.17-386	75.55% <62.96%> (+0.04%)	⬆️
go-1.17-amd64	75.54% <62.96%> (+0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
os/gcron/gcron.go	0.00% <0.00%> (ø)
os/glog/glog.go	42.85% <ø> (ø)
os/glog/glog_logger_handler.go	91.17% <0.00%> (ø)
os/gtimer/gtimer_entry.go	80.88% <ø> (ø)
os/gcron/gcron_cron.go	53.27% <50.00%> (ø)
net/ghttp/ghttp_server.go	64.38% <66.66%> (ø)
os/gcron/gcron_entry.go	60.63% <71.42%> (+0.85%)	⬆️
net/gtrace/gtrace.go	70.51% <100.00%> (+5.17%)	⬆️
os/gfsnotify/gfsnotify_filefunc.go	74.02% <0.00%> (-3.90%)	⬇️
os/gcron/gcron_schedule.go	67.52% <0.00%> (+0.42%)	⬆️
... and 3 more

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