feat: Dosguard API weights (#2082)

Experimental support for Dosguard API weights.

tests/unit/util/StringHashTests.cpp

@@ -0,0 +1,70 @@
+//------------------------------------------------------------------------------
+/*
+    This file is part of clio: https://github.com/XRPLF/clio
+    Copyright (c) 2025, 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/StringHash.hpp"
+
+#include <gtest/gtest.h>
+
+#include <functional>
+#include <string>
+#include <string_view>
+#include <unordered_set>
+
+using namespace util;
+
+TEST(StringHashTest, HashesConsistently)
+{
+    StringHash hasher;
+
+    std::string const stdString = "test string";
+    std::string_view const strView = "test string";
+    char const* cString = "test string";
+
+    EXPECT_EQ(hasher(stdString), hasher(strView));
+    EXPECT_EQ(hasher(stdString), hasher(cString));
+    EXPECT_EQ(hasher(strView), hasher(cString));
+}
+
+TEST(StringHashTest, TransparentLookup)
+{
+    std::unordered_set<std::string, StringHash, std::equal_to<>> stringSet{"hello world"};
+
+    std::string const stdString = "hello world";
+    std::string_view const strView = "hello world";
+    char const* cString = "hello world";
+
+    EXPECT_TRUE(stringSet.contains(stdString));
+    EXPECT_TRUE(stringSet.contains(strView));
+    EXPECT_TRUE(stringSet.contains(cString));
+
+    EXPECT_FALSE(stringSet.contains("goodbye world"));
+}
+
+TEST(StringHashTest, EmptyStrings)
+{
+    StringHash hasher;
+
+    std::string const emptyStdString;
+    std::string_view const emptyStrView;
+    char const* emptyCString = "";
+
+    EXPECT_EQ(hasher(emptyStdString), hasher(emptyStrView));
+    EXPECT_EQ(hasher(emptyStdString), hasher(emptyCString));
+    EXPECT_EQ(hasher(emptyStrView), hasher(emptyCString));
+}