- This addresses some formatting disparities between the Java and C#
  tests to help make them more line-to-line matching.
- Comments added in places where our tests differ from upstream.
- RandomizedTesting.Generators extension method import moved behind a
  `#if !NET6_0_OR_GREATER` check, as the namespace was being ignored on
  .NET 6+ in a few files since .NET 6 added a Random.NextInt64 method.
  This will help prevent other contributors from thinking this namespace
  is not needed.
- A unit test assertion bug on arm64 with division by zero is fixed.
- The `build` file has been chmod'ed +x for ease of use
- Rider IDE files added

…apache#259

…he#259