feat:(decoder) add option CaseSensitive

[AsterDY]

fix: #690

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 51.71%. Comparing base (9e5bbc5) to head (5a6fb2f).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/decoder/optdec/structs.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #709      +/-   ##
==========================================
- Coverage   51.85%   51.71%   -0.14%     
==========================================
  Files         130      127       -3     
  Lines       11020    10931      -89     
==========================================
- Hits         5714     5653      -61     
+ Misses       4971     4956      -15     
+ Partials      335      322      -13     

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