Add dense components and benchmark

[DrSmugleaf]

Uses Arch.LowLevel.SparseJaggedArray so that Genaray lives on in the engine and because I'm not coding something that someone else already did twice

Also if we end up using it we need to add Arch.LowLevel to the external licenses file

Attribute is public so content can use it

Entity query enumerators do not use the array for all/most of their comp lookups yet, only the metadata component query does

// * Summary *

BenchmarkDotNet v0.15.8, Windows 10 (10.0.19045.6466/22H2/2022Update)
AMD Ryzen 9 9900X 4.40GHz, 1 CPU, 24 logical and 12 physical cores
.NET SDK 10.0.301
  [Host]     : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v4
  DefaultJob : .NET 10.0.9 (10.0.9, 10.0.926.27113), X64 RyuJIT x86-64-v4

Before

Method	N	Mean	Error	StdDev	Allocated
GetEntityQuery	1	11.501 ns	0.2400 ns	0.3875 ns	-
GetComponent	1	10.345 ns	0.1566 ns	0.1308 ns	-
HasComponent	1	9.996 ns	0.2142 ns	0.3335 ns	-
TryGetComponent	1	11.048 ns	0.1920 ns	0.1796 ns	-
GetEntityQuery	10	28.262 ns	0.1948 ns	0.1626 ns	-
GetComponent	10	93.344 ns	0.6418 ns	0.5359 ns	-
HasComponent	10	89.547 ns	1.5452 ns	1.4454 ns	-
TryGetComponent	10	95.554 ns	0.4721 ns	0.4185 ns	-
GetEntityQuery	100	188.635 ns	1.0761 ns	0.8986 ns	-
GetComponent	100	976.291 ns	19.3674 ns	49.6460 ns	-
HasComponent	100	1,106.032 ns	22.1331 ns	51.2967 ns	-
TryGetComponent	100	1,010.646 ns	20.0130 ns	49.0923 ns	-
GetEntityQuery	1000	2,331.782 ns	46.4072 ns	104.7487 ns	-
GetComponent	1000	9,885.056 ns	195.7707 ns	491.1503 ns	-
HasComponent	1000	8,640.575 ns	171.9456 ns	358.9144 ns	-
TryGetComponent	1000	10,054.008 ns	200.9216 ns	419.3983 ns	-

After

Method	N	Mean	Error	StdDev	Median	Allocated
GetEntityQuery	1	9.054 ns	0.1000 ns	0.0835 ns	9.051 ns	-
GetComponent	1	6.503 ns	0.0720 ns	0.0673 ns	6.476 ns	-
HasComponent	1	7.196 ns	0.1622 ns	0.3491 ns	6.980 ns	-
TryGetComponent	1	7.767 ns	0.0436 ns	0.0364 ns	7.759 ns	-
GetEntityQuery	10	17.693 ns	0.1442 ns	0.1204 ns	17.637 ns	-
GetComponent	10	58.170 ns	0.5472 ns	0.4569 ns	58.347 ns	-
HasComponent	10	64.693 ns	0.1281 ns	0.1000 ns	64.692 ns	-
TryGetComponent	10	82.084 ns	0.4280 ns	0.4004 ns	81.951 ns	-
GetEntityQuery	100	100.406 ns	1.4315 ns	1.2690 ns	100.107 ns	-
GetComponent	100	619.721 ns	2.3759 ns	2.1062 ns	618.691 ns	-
HasComponent	100	523.987 ns	2.4733 ns	2.0654 ns	523.052 ns	-
TryGetComponent	100	667.267 ns	2.5387 ns	2.1199 ns	667.794 ns	-
GetEntityQuery	1000	1,319.189 ns	4.7558 ns	4.2159 ns	1,320.926 ns	-
GetComponent	1000	6,750.258 ns	37.6469 ns	31.4369 ns	6,744.233 ns	-
HasComponent	1000	5,222.566 ns	28.4585 ns	22.2185 ns	5,231.129 ns	-
TryGetComponent	1000	7,128.651 ns	89.5417 ns	74.7713 ns	7,118.728 ns	-