DMM Offline (#198)

* Process DMM all locally

single call to github to download the repo archive.
remove need for PAT
update RTN to 0.2.13
change to batch_parse for title parsing from RTN

* introduce concurrent dictionary, and parallelism

src/shared/Extensions/DictionaryExtensions.cs

@@ -0,0 +1,19 @@
+namespace SharedContracts.Extensions;
+
+public static class DictionaryExtensions
+{
+    public static ConcurrentDictionary<TKey, TValue> ToConcurrentDictionary<TSource, TKey, TValue>(
+        this IEnumerable<TSource> source,
+        Func<TSource, TKey> keySelector,
+        Func<TSource, TValue> valueSelector) where TKey : notnull
+    {
+        var concurrentDictionary = new ConcurrentDictionary<TKey, TValue>();
+
+        foreach (var element in source)
+        {
+            concurrentDictionary.TryAdd(keySelector(element), valueSelector(element));
+        }
+
+        return concurrentDictionary;
+    }
+}