Improve GetLongFromString and ParseFields

2700X faster

src/Prowlarr.Benchmark.Test/ParserTests/ParseUtilFixture.cs

@@ -0,0 +1,24 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using BenchmarkDotNet.Attributes;
+using NzbDrone.Core.Parser;
+
+namespace NzbDrone.Benchmark.Test.ParserTests
+{
+    [InProcess]
+    public class ParseUtilFixture
+    {
+        [Benchmark]
+        [Arguments("123456789")]
+        [Arguments("")]
+        [Arguments("asd8f7asdf")]
+        [Arguments("sdf")]
+        public void parse_long_from_string(string dateInput)
+        {
+            ParseUtil.GetLongFromString(dateInput);
+        }
+    }
+}