bugfix：【frontend-gray插件】针对fetch的请求，强制不缓存

[heimanba]

【frontend-gray插件】针对fetch的请求，强制不缓存

针对fetch请求，在response中添加header: "cache-control", "no-cache, no-store, max-age=0, must-revalidate"

proxywasm.ReplaceHttpResponseHeader("cache-control", "no-cache, no-store, max-age=0, must-revalidate")

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.41%. Comparing base (ef31e09) to head (4473f0f).
Report is 332 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1856      +/-   ##
==========================================
+ Coverage   35.91%   43.41%   +7.50%     
==========================================
  Files          69       76       +7     
  Lines       11576    12301     +725     
==========================================
+ Hits         4157     5340    +1183     
+ Misses       7104     6628     -476     
- Partials      315      333      +18     

see 71 files with indirect coverage changes

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[CH3CHO]

LGTM