Enable body for delete requests and enable patch requests

[etr]

Issue or RFC Endorsed by Maintainers

#150

Description of the Change

This change enables the following two features:

• Request body processing for DELETE requests
• Support for PATCH requests

Verification Process

Unit/Integration tests

Release Notes

Added support for body parsing in DELETE requests.
Added support for PATCH method

[codecov-io]

Codecov Report

Merging #151 into master will decrease coverage by 1.28%.
The diff coverage is 96.42%.

@@            Coverage Diff             @@
##           master     #151      +/-   ##
==========================================
- Coverage   96.55%   95.26%   -1.29%     
==========================================
  Files          34       34              
  Lines        3019     3169     +150     
==========================================
+ Hits         2915     3019     +104     
- Misses        104      150      +46

Impacted Files	Coverage Δ
src/httpserver/http_utils.hpp	100% <ø> (ø)	⬆️
src/httpserver/http_resource.hpp	41.17% <0%> (+3.24%)	⬆️
src/http_resource.cpp	84.61% <100%> (+1.28%)	⬆️
test/integ/basic.cpp	99.67% <100%> (ø)	⬆️
src/httpserver/deferred_response.hpp	100% <100%> (ø)	⬆️
test/integ/deferred.cpp	100% <100%> (ø)	⬆️
src/webserver.cpp	90.39% <100%> (+1.54%)	⬆️
src/http_utils.cpp	99.17% <100%> (ø)	⬆️
src/deferred_response.cpp	100% <100%> (ø)	⬆️
src/httpserver/string_response.hpp	40% <0%> (-60%)	⬇️
... and 14 more

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