chore: Fix pretty printing for QString (#101)

Previously QString was printed symbol by symbol. E.g.:

reader.readWholeFileAfter(3, 1)
    Which is: { "i", "n", "e", " ", "2", "
", "L", "i", "n", "e", " ", "3" }

test/DocumentContextReaderTest.cpp

@@ -27,6 +27,16 @@ using namespace QodeAssist::Context;
 using namespace QodeAssist::LLMCore;
 using namespace QodeAssist::Settings;
 
+QT_BEGIN_NAMESPACE
+
+// gtest can't pick pretty printer when comparing QString
+inline void PrintTo(const QString &value, ::std::ostream *out)
+{
+    *out << '"' << value.toStdString() << '"';
+}
+
+QT_END_NAMESPACE
+
 std::ostream &operator<<(std::ostream &out, const QString &value)
 {
     out << '"' << value.toStdString() << '"';