refactor: Coroutine based webserver (#1699)

Code of new coroutine-based web server. The new server is not connected
to Clio and not ready to use yet.
For #919.

tests/unit/test_data/SslCert.cpp

@@ -0,0 +1,105 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of clio: https://github.com/XRPLF/clio
+    Copyright (c) 2024, the clio developers.
+
+    Permission to use, copy, modify, and distribute this software for any
+    purpose with or without fee is hereby granted, provided that the above
+    copyright notice and this permission notice appear in all copies.
+
+    THE  SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+    WITH  REGARD  TO  THIS  SOFTWARE  INCLUDING  ALL  IMPLIED  WARRANTIES  OF
+    MERCHANTABILITY  AND  FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+    ANY  SPECIAL,  DIRECT,  INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+    WHATSOEVER  RESULTING  FROM  LOSS  OF USE, DATA OR PROFITS, WHETHER IN AN
+    ACTION  OF  CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+//==============================================================================
+
+#include "util/TmpFile.hpp"
+
+#include <test_data/SslCert.hpp>
+
+#include <string_view>
+
+namespace tests {
+
+std::string_view
+sslCert()
+{
+    static auto constexpr CERT = R"(
+-----BEGIN CERTIFICATE-----
+MIIDrjCCApagAwIBAgIJAOE4Hv/P8CO3MA0GCSqGSIb3DQEBCwUAMDkxEjAQBgNV
+BAMMCTEyNy4wLjAuMTELMAkGA1UEBhMCVVMxFjAUBgNVBAcMDVNhbiBGcmFuc2lz
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+PAMNb1i80cMsjK98xXDdr+7Uvy5M4COMwA5XHmMZDEW8Jw==
+-----END CERTIFICATE-----
+)";
+    return CERT;
+}
+
+TmpFile
+sslCertFile()
+{
+    return TmpFile{sslCert()};
+}
+
+std::string_view
+sslKey()
+{
+    static auto constexpr KEY = R"(
+-----BEGIN RSA PRIVATE KEY-----
+MIIEpAIBAAKCAQEAqP3K4WDIhk63zbxSoN8tJqRZD3W0IWFMwCluZchUwsHPxEC4
+32sPk58YonynY5nGtTeSGhedSqHD0gFBLcU/su4dSsj+kgGgJwKmiPmoQiTpzEmd
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+Zl3fuvbMYcmYKgutFcRj+8NvzRWT2suzGU2x4PiPX+fh5kpvmMdvLA==
+-----END RSA PRIVATE KEY-----
+)";
+    return KEY;
+}
+
+TmpFile
+sslKeyFile()
+{
+    return TmpFile{sslKey()};
+}
+
+}  // namespace tests