AK+Everywhere: Rename String to DeprecatedString

We have a new, improved string type coming up in AK (OOM aware, no null
state), and while it's going to use UTF-8, the name UTF8String is a
mouthful - so let's free up the String name by renaming the existing
class.
Making the old one have an annoying name will hopefully also help with
quick adoption :^)

Userland/Libraries/LibSQL/TupleDescriptor.h

@@ -13,9 +13,9 @@
 namespace SQL {
 
 struct TupleElementDescriptor {
-    String schema { "" };
-    String table { "" };
-    String name { "" };
+    DeprecatedString schema { "" };
+    DeprecatedString table { "" };
+    DeprecatedString name { "" };
     SQLType type { SQLType::Text };
     Order order { Order::Ascending };
 
@@ -29,7 +29,7 @@ struct TupleElementDescriptor {
     }
     void deserialize(Serializer& serializer)
     {
-        name = serializer.deserialize<String>();
+        name = serializer.deserialize<DeprecatedString>();
         type = (SQLType)serializer.deserialize<u8>();
         order = (Order)serializer.deserialize<u8>();
     }
@@ -39,9 +39,9 @@ struct TupleElementDescriptor {
         return (sizeof(u32) + name.length()) + 2 * sizeof(u8);
     }
 
-    String to_string() const
+    DeprecatedString to_string() const
     {
-        return String::formatted("  name: {} type: {} order: {}", name, SQLType_name(type), Order_name(order));
+        return DeprecatedString::formatted("  name: {} type: {} order: {}", name, SQLType_name(type), Order_name(order));
     }
 };
 
@@ -91,13 +91,13 @@ public:
         return len;
     }
 
-    String to_string() const
+    DeprecatedString to_string() const
     {
-        Vector<String> elements;
+        Vector<DeprecatedString> elements;
         for (auto& element : *this) {
             elements.append(element.to_string());
         }
-        return String::formatted("[\n{}\n]", String::join('\n', elements));
+        return DeprecatedString::formatted("[\n{}\n]", DeprecatedString::join('\n', elements));
     }
 
     using Vector<TupleElementDescriptor>::operator==;