feat & enhace: xlog with file core and multi cores.

[benz9527]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 67.18062% with 149 lines in your changes are missing coverage. Please review.

Project coverage is 76.99%. Comparing base (485faa9) to head (4fd6045).

Files	Patch %	Lines
xlog/rotate_log.go	73.22%	20 Missing and 14 partials ⚠️
xlog/tee_core.go	45.16%	30 Missing and 4 partials ⚠️
xlog/file_core.go	75.55%	17 Missing and 5 partials ⚠️
xlog/single_log.go	73.68%	12 Missing and 8 partials ⚠️
xlog/zap.go	45.83%	12 Missing and 1 partial ⚠️
xlog/gorm.go	36.36%	6 Missing and 1 partial ⚠️
xlog/ants.go	28.57%	4 Missing and 1 partial ⚠️
xlog/fx.go	28.57%	4 Missing and 1 partial ⚠️
xlog/goredis.go	28.57%	4 Missing and 1 partial ⚠️
xlog/buffer_syncer.go	88.23%	1 Missing and 1 partial ⚠️
... and 1 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #29      +/-   ##
==========================================
- Coverage   77.34%   76.99%   -0.36%     
==========================================
  Files          68       72       +4     
  Lines        8741     9076     +335     
==========================================
+ Hits         6761     6988     +227     
- Misses       1522     1607      +85     
- Partials      458      481      +23     

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