Add File validation (#344)

* Add file validation

* Revert "Added checks.dat build script (#343)"

This reverts commit 39228f88e705b58858d162256a5b5e10fe99148c.

* Update to use pwsh

* Wrap code in using

Libraries/SPTarkov.Server.Core/Utils/JsonUtil.cs

@@ -154,6 +154,16 @@ public class JsonUtil
         return await JsonSerializer.DeserializeAsync(fs, type, jsonSerializerOptionsNoIndent);
     }
 
+    /// <summary>
+    ///     Convert JSON into an object from a MemoryStream asynchronously
+    /// </summary>
+    /// <param name="fs">The memory stream to deserialize</param>
+    /// <returns>T</returns>
+    public async Task<T?> DeserializeFromMemoryStreamAsync<T>(MemoryStream ms)
+    {
+        return await JsonSerializer.DeserializeAsync<T>(ms, jsonSerializerOptionsNoIndent);
+    }
+
     /// <summary>
     ///     Convert an object into JSON
     /// </summary>