More generators (#2377)

* custom-set: add generator

* dnd-character: add generator

* bowling: add generator

* go-counting: add generator

[no important files changed]

* circular-buffer: add generator

* high-scores: add generator

* rational-numbers: add generator

* complex-numbers: add generator

* Remove generators

exercises/practice/bowling/.meta/Generator.tpl

@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+using Xunit;
+
+public class {{ testClass }}
+{
+    {{- for test in tests }}
+    [Fact{{ if !for.first }}(Skip = "Remove this Skip property to run this test"){{ end }}]
+    public void {{ test.testMethod }}()
+    {
+        var sut = new BowlingGame();
+        {{- if !test.input.previousRolls.empty? }}
+        int[] previousRolls = {{ test.input.previousRolls }};
+        foreach (var roll in previousRolls)
+        {
+            sut.Roll(roll);
+        }
+        {{- end -}}
+        {{- if test.expected.error }}
+            Assert.Throws<ArgumentException>(() => sut.{{ test.testedMethod }}({{ test.input.roll }}));
+        {{ else }}
+            Assert.Equal({{ test.expected }}, sut.{{ test.testedMethod }}({{ test.input.roll }}));
+        {{ end -}}
+    }
+    {{ end -}}
+}