feat: add proxyRequest util

[pi0]

Resolves #224 (Thanks @P4sca1 for suggestion)

This PR adds a new proxyRequest utility built on top of sendProxy that proxies incoming request headers, body and method to target. (path is not rewritten)

[codecov]

Codecov Report

Merging #226 (8a2ef5b) into main (e6a9f94) will increase coverage by 0.32%.
The diff coverage is 87.50%.

@@            Coverage Diff             @@
##             main     #226      +/-   ##
==========================================
+ Coverage   76.34%   76.67%   +0.32%     
==========================================
  Files          20       20              
  Lines        1171     1209      +38     
  Branches      222      227       +5     
==========================================
+ Hits          894      927      +33     
- Misses        277      282       +5     

Impacted Files	Coverage Δ
src/utils/proxy.ts	84.52% <87.50%> (+1.91%)	⬆️

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[scripness]

@pi0 is it supposed not to rewrite the path? I still get the path rewritten - proxying in a nuxt server middleware to an internal route, just trying to hide some path in the url.