Fuzz

[huangminghuang]

Add fuzz targets and fixe bugs from fuzz cases.

[codecov]

Codecov Report

Attention: Patch coverage is 77.23577% with 56 lines in your changes missing coverage. Please review.

Project coverage is 89.41%. Comparing base (b51816d) to head (ec99397).

Files with missing lines	Patch %	Lines
include/hpp_proto/pb_serializer.hpp	64.58%	19 Missing and 15 partials ⚠️
include/hpp_proto/dynamic_serializer.hpp	33.33%	14 Missing and 2 partials ⚠️
include/hpp_proto/flat_map.hpp	0.00%	4 Missing and 1 partial ⚠️
tests/test_util.hpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop      #47      +/-   ##
===========================================
- Coverage    90.14%   89.41%   -0.74%     
===========================================
  Files           41       46       +5     
  Lines         7816     8310     +494     
  Branches       559      606      +47     
===========================================
+ Hits          7046     7430     +384     
- Misses         484      568      +84     
- Partials       286      312      +26     

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