chore: remove unused NewWithContext

[bytejedi]

remove unused NewWithContext

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: +0.05 🎉

Comparison is base (c251049) 39.03% compared to head (0667100) 39.08%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2535      +/-   ##
==========================================
+ Coverage   39.03%   39.08%   +0.05%     
==========================================
  Files         617      617              
  Lines       37047    37041       -6     
==========================================
+ Hits        14460    14478      +18     
+ Misses      20993    20974      -19     
+ Partials     1594     1589       -5     

Impacted Files	Coverage Δ
v2ray.go	66.47% <ø> (+2.22%)	⬆️

... and 8 files with indirect coverage changes

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[AkinoKaede]

It may not used in V2Ray, but it is a public function so other projects can use it.