misc(http) skip preaccess/access phases on non-debug builds

[thibaultcha]

No description provided.

[codecov]

Codecov Report

Merging #11 (de4a28d) into main (5c4facc) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #11   +/-   ##
=======================================
  Coverage   82.87%   82.87%           
=======================================
  Files          20       20           
  Lines        2207     2207           
=======================================
  Hits         1829     1829           
  Misses        378      378           

Flag	Coverage Δ
unit	82.87% <ø> (ø)

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Impacted Files	Coverage Δ
src/http/ngx_http_wasm_module.c	90.95% <ø> (ø)

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