Add CLSS (The C# Language Syntactic Sugar suite) packages

[tonygiang]

The NuGet package needs to respect a few constraints in order to be listed in the curated list:

• [x] Add a link to the NuGet package:
  • https://www.nuget.org/packages/CLSS.Constants.DefaultRandom
  • https://www.nuget.org/packages/CLSS.Constants.NoOp
  • https://www.nuget.org/packages/CLSS.Constants.ValueEquivalentStrings
  • https://www.nuget.org/packages/CLSS.ExtensionMethods.CommonMathOps
  • https://www.nuget.org/packages/CLSS.ExtensionMethods.IComparable.ClampToRange
  • https://www.nuget.org/packages/CLSS.ExtensionMethods.IComparable.InRange
  • https://www.nuget.org/packages/CLSS.ExtensionMethods.IDictionary.GetOrAdd
  • https://www.nuget.org/packages/CLSS.ExtensionMethods.IDictionary.MoveKey
  • https://www.nuget.org/packages/CLSS.ExtensionMethods.IDictionary.SwapKeys
  • https://www.nuget.org/packages/CLSS.ExtensionMethods.IEnumerable.ForEach
  • https://www.nuget.org/packages/CLSS.ExtensionMethods.IEnumerable.Looping
  • https://www.nuget.org/packages/CLSS.ExtensionMethods.IEnumerable.MinMaxBy
  • https://www.nuget.org/packages/CLSS.ExtensionMethods.IEnumerator.LoopNext
  • https://www.nuget.org/packages/CLSS.ExtensionMethods.IList.ExclusiveSample
  • https://www.nuget.org/packages/CLSS.ExtensionMethods.IList.FillBy
  • https://www.nuget.org/packages/CLSS.ExtensionMethods.IList.FirstLastIndex
  • https://www.nuget.org/packages/CLSS.ExtensionMethods.IList.GetLoopingElementAt
  • https://www.nuget.org/packages/CLSS.ExtensionMethods.IList.GetRandom
  • https://www.nuget.org/packages/CLSS.ExtensionMethods.IList.GetWeightedRandom
  • https://www.nuget.org/packages/CLSS.ExtensionMethods.IList.Shuffle
  • https://www.nuget.org/packages/CLSS.ExtensionMethods.IList.SwapIndices
  • https://www.nuget.org/packages/CLSS.ExtensionMethods.Object.As
  • https://www.nuget.org/packages/CLSS.ExtensionMethods.Object.Is
  • https://www.nuget.org/packages/CLSS.ExtensionMethods.Object.ToStringFormattedBy
  • https://www.nuget.org/packages/CLSS.ExtensionMethods.Pipe
  • https://www.nuget.org/packages/CLSS.ExtensionMethods.Reference.Action.Once
  • https://www.nuget.org/packages/CLSS.ExtensionMethods.String.AsEnum
  • https://www.nuget.org/packages/CLSS.Types.EventLatch
  • https://www.nuget.org/packages/CLSS.Types.MemoizedFunc
  • https://www.nuget.org/packages/CLSS.Types.Reference
  • https://www.nuget.org/packages/CLSS.Types.SortedAction
  • https://www.nuget.org/packages/CLSS.Types.ValueRange
  • https://www.nuget.org/packages/CLSS.Types.WeightedSampler
• [x] It must have non-preview versions (e.g 1.0.0 but not 1.0.0-preview.1)
• [x] It must provide .NETStandard2.0 assemblies as part of its package
• [x] The lowest version added must be the lowest .NETStandard2.0 version available
• [x] The package has been tested with the Unity editor
• [x] The package has been tested with a Unity standalone player
  • if the package is not compatible with standalone player, please add a comment to a Known issues section to the top level readme.md
• [x] All package dependencies with .NETStandard 2.0 target must be added to the PR (respecting the same rules above)
  • Note that if a future version of the package adds a new dependency, this dependency will have to be added manually as well

Note: The server will be updated only when a new version tag is pushed on the main branch, not necessarily after merging this pull-request.