Global logger

[realityone]

Description (what this PR does / why we need it):

Global GetLogger return the inner Logger in global logger appliance, this will make inconsistent logger after SetLogger is called.

Return global logger appliance directly to wrap the inner logger, always make the all logger is same from GetLogger.

Which issue(s) this PR fixes (resolves / be part of):

Other special notes for the reviewers:

[codecov-commenter]

Codecov Report

Merging #2265 (10dc850) into main (57dee51) will decrease coverage by 0.05%. The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             main    #2265      +/-   ##
==========================================
- Coverage   85.63%   85.57%   -0.06%     
==========================================
  Files          87       87              
  Lines        3793     3793              
==========================================
- Hits         3248     3246       -2     
- Misses        378      380       +2     
  Partials      167      167              

Impacted Files	Coverage Δ
log/global.go	77.55% <66.66%> (-4.09%)	:arrow_down:

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[SeniorPlayer]

func (a *loggerAppliance) Log(level Level, keyvals ...interface{}) error {
	return a.Logger.Log(level, keyvals...)
}

This increases the call depth of global logger.