gstr.CaseCamel add special case

[promisingMan]

special case, all characters are uppercase or numbers or underscores, eg:HELLO_WORLD->HelloWorld

@[https://github.com/gogf/gf/issues/2078] @DGuang21

[codecov-commenter]

Codecov Report

Base: 76.49% // Head: 76.50% // Increases project coverage by +0.00% :tada:

Coverage data is based on head (495b146) compared to base (127e8af). Patch coverage: 91.66% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2087   +/-   ##
=======================================
  Coverage   76.49%   76.50%           
=======================================
  Files         580      580           
  Lines       48087    48111   +24     
=======================================
+ Hits        36785    36805   +20     
- Misses       9291     9293    +2     
- Partials     2011     2013    +2     

Flag	Coverage Δ
go-1.15-386	76.47% <91.66%> (-0.03%)	:arrow_down:
go-1.15-amd64	76.51% <91.66%> (+<0.01%)	:arrow_up:
go-1.16-386	76.50% <91.66%> (+<0.01%)	:arrow_up:
go-1.16-amd64	76.53% <91.66%> (+0.03%)	:arrow_up:
go-1.17-386	76.51% <91.66%> (+<0.01%)	:arrow_up:
go-1.17-amd64	76.53% <91.66%> (+0.01%)	:arrow_up:
go-1.18-386	76.42% <91.66%> (-0.01%)	:arrow_down:
go-1.18-amd64	76.43% <91.66%> (-0.04%)	:arrow_down:

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

Impacted Files	Coverage Δ
text/gstr/gstr_case.go	96.24% <91.66%> (-1.01%)	:arrow_down:
os/gfsnotify/gfsnotify_watcher_loop.go	83.19% <0.00%> (-1.69%)	:arrow_down:

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[gqcn]

@promisingMan 请跟进。

[promisingMan]

收到，强哥，周末跟进，最近比较忙