Add fuzzing test for libhttpserver and submit to oss-fuzz

[sgbhat2]

Requirements for Adding the fuzzing test

Fuzzing is a well-known technique to unravel security vulnerabilities and programming errors in the code.

This PR is aimed to add fuzz tests to libhttpserver using LLVM's LibFuzzer with a goal to integrate libhttpserver to oss-fuzz.

Issue or RFC Endorsed by Maintainers

https://github.com/etr/libhttpserver/commit/bcd12d363fdc90df0c87779379f9548559f5f604 --> This bug was found from the fuzz testing.

Description of the Change

Following changes are made following the oss-fuzz guide

• Add a fuzz target to test the HTTP server
• Add seed corpus to help LibFuzzer generate meaningful inputs

The fuzz targets are not integrated with the build system of the library. Instructions to build and run the fuzz targets are mentioned in the README.md

Alternate Designs

N/A

Possible Drawbacks

N/A

Verification Process

The fuzz target is locally built and verified to run by following these steps

Release Notes

• N/A

[codecov[bot]]

Codecov Report

Merging #213 (aa058fe) into master (7cb4eb8) will increase coverage by 0.01%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #213      +/-   ##
==========================================
+ Coverage   95.60%   95.62%   +0.01%     
==========================================
  Files          35       35              
  Lines        3233     3246      +13     
==========================================
+ Hits         3091     3104      +13     
  Misses        142      142              

Impacted Files	Coverage Δ
test/unit/http_utils_test.cpp	100.00% <0.00%> (ø)
src/http_utils.cpp	99.17% <0.00%> (+<0.01%)	:arrow_up:

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