Collections update to 4 0 0

[kaltinril]

1. Copied Collections.md and object-pooling.md out of Archive
2. Re-worked many of the code examples
3. Added code examples for every collection and extension
4. ObjectPool and Pool were somehow intertwined in the example code previously, that is now separated and fixed.
5. Benchmarked the C# .NET standard library functions for:
   1. ConcurrentBag vs Bag
      1. MonoGame.Extended's Bag was insanely faster, which makes sense because Microsoft's ConcurrentBag is thread safe.
      2. Add was 100 times slower than MonoGame's (92ms vs 1161ms)
      3. Remove was 10 times slower than MonoGame's (76ms vs 900ms)
   2. KeyedCollection
      1. Adding was close, but Microsoft's implementation had horrible Remove performance (2ms vs 646ms)

Since it was such a big change, I anticipate typo/spelling/formatting/and code issues. Please provide input and I'll work on the fixes.

I'll work on the Samples and push those up in that Repo.

BenchmarkDotNet v0.14.0, Windows 11 (10.0.22631.4037/23H2/2023Update/SunValley3)
AMD Ryzen 7 5800X, 1 CPU, 16 logical and 8 physical cores
.NET SDK 8.0.304
  [Host]     : .NET 8.0.8 (8.0.824.36612), X64 RyuJIT AVX2
  Job-FQVXUQ : .NET 8.0.8 (8.0.824.36612), X64 RyuJIT AVX2

InvocationCount=1  UnrollFactor=1

| Method                         | Mean        | Error     | StdDev    |
|------------------------------- |------------:|----------:|----------:|
| AddToConcurrentBag             | 1,161.49 ms | 23.163 ms | 23.786 ms |
| AddToMonoGameBag               |    92.00 ms |  1.258 ms |  1.176 ms |
| RemoveFromConcurrentBag        |   901.99 ms |  5.320 ms |  4.154 ms |
| RemoveFromMonogameBagBestCase  |    69.80 ms |  0.409 ms |  0.383 ms |
| RemoveFromMonogameBagWorseCase |    76.05 ms |  0.254 ms |  0.199 ms |

BenchmarkDotNet v0.14.0, Windows 11 (10.0.22631.4037/23H2/2023Update/SunValley3)
AMD Ryzen 7 5800X, 1 CPU, 16 logical and 8 physical cores
.NET SDK 8.0.304
  [Host]     : .NET 8.0.8 (8.0.824.36612), X64 RyuJIT AVX2 [AttachedDebugger]
  Job-FPKGHY : .NET 8.0.8 (8.0.824.36612), X64 RyuJIT AVX2

InvocationCount=1  UnrollFactor=1

| Method                            | Mean       | Error     | StdDev    | Median      |
|---------------------------------- |-----------:|----------:|----------:|------------:|
| AddToSystemKeyedCollection        |   2.086 ms | 0.1203 ms | 0.3527 ms |   2.0842 ms |
| AddToMonoGameKeyedCollection      |   1.019 ms | 0.0472 ms | 0.1354 ms |   0.9855 ms |
| RemoveFromSystemKeyedCollection   | 646.276 ms | 5.2726 ms | 4.9320 ms | 643.3841 ms |
| RemoveFromMonoGameKeyedCollection |   1.036 ms | 0.0459 ms | 0.1232 ms |   0.9987 ms |

[kaltinril]

I've created the sample code that prints (to debug) to demonstrate each collection, pool, and extension method.

craftworkgames/MonoGame.Extended-samples#15

[AristurtleDev]

Couple of changes requested