feat: add bounded NomadNet forms

tests/native/test_nomadnet_form_alloc_failure.cpp

@@ -0,0 +1,39 @@
+#include <cstdlib>
+#include <new>
+
+#include "NomadNetForm.h"
+
+namespace {
+bool fail_next_allocation = false;
+}
+
+void* operator new(std::size_t size) {
+    if (fail_next_allocation) {
+        fail_next_allocation = false;
+        throw std::bad_alloc();
+    }
+    if (void* memory = std::malloc(size)) return memory;
+    throw std::bad_alloc();
+}
+
+void* operator new[](std::size_t size) {
+    return ::operator new(size);
+}
+
+void operator delete(void* memory) noexcept { std::free(memory); }
+void operator delete[](void* memory) noexcept { std::free(memory); }
+void operator delete(void* memory, std::size_t) noexcept { std::free(memory); }
+void operator delete[](void* memory, std::size_t) noexcept { std::free(memory); }
+
+int main() {
+    using namespace UI::LXMF::NomadNet;
+    FormState state;
+    ExternalVector<uint8_t> output;
+    fail_next_allocation = true;
+    try {
+        const auto result = state.encode("", output);
+        return result == FormEncodeResult::OUTPUT_TOO_LARGE && output.empty() ? 0 : 1;
+    } catch (...) {
+        return 2;
+    }
+}