Made use of libfuzzer

tests/fuzzers/README.md

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+Prior to running the fuzzers, build and prepare for instance as follows:
+```sh
+CXX=clang++ cmake -DBUILD_FUZZING=1 ..
+make
+export LSAN_OPTIONS=detect_leaks=0
+```

tests/fuzzers/http_header_field_value_semicolon_separated_attributes_parse.cpp

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+#include "utility.hpp"
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+  SimpleWeb::HttpHeader::FieldValue::SemicolonSeparatedAttributes::parse(std::string(reinterpret_cast<const char *>(data), size));
+  return 0;
+}

tests/fuzzers/http_header_parse.cpp

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+#include "utility.hpp"
+#include <sstream>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+  std::stringstream ss;
+  ss << std::string(reinterpret_cast<const char *>(data), size);
+  SimpleWeb::HttpHeader::parse(ss);
+  return 0;
+}

tests/fuzzers/percent_decode.cpp

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+#include "utility.hpp"
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+  SimpleWeb::Percent::decode(std::string(reinterpret_cast<const char *>(data), size));
+  return 0;
+}

tests/fuzzers/query_string_parse.cpp

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+#include "utility.hpp"
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+  SimpleWeb::QueryString::parse(std::string(reinterpret_cast<const char *>(data), size));
+  return 0;
+}

tests/fuzzers/request_message_parse.cpp

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+#include "utility.hpp"
+#include <sstream>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+  std::stringstream ss;
+  ss << std::string(reinterpret_cast<const char *>(data), size);
+  std::string method, path, query_string, version;
+  SimpleWeb::CaseInsensitiveMultimap header;
+  SimpleWeb::RequestMessage::parse(ss, method, path, query_string, version, header);
+  return 0;
+}

tests/fuzzers/response_message_parse.cpp

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+#include "utility.hpp"
+#include <sstream>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
+  std::stringstream ss;
+  ss << std::string(reinterpret_cast<const char *>(data), size);
+  std::string version, status_code;
+  SimpleWeb::CaseInsensitiveMultimap header;
+  SimpleWeb::ResponseMessage::parse(ss, version, status_code, header);
+  return 0;
+}