Hierarchies: Learning page for grouping

[grigasp]

Part of https://github.com/iTwin/presentation/issues/423

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🦋 Changeset detected

Latest commit: 5ad74e5e97d2a08c8717ddb01ef12d6fe1e14da0

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

| Name | Type | | ------------------------------------- | ----- | | @itwin/presentation-hierarchies | Minor | | @itwin/presentation-hierarchies-react | Patch |

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Hierarchies benchmark

Benchmark suite	Current: 5ad74e5e97d2a08c8717ddb01ef12d6fe1e14da0	Previous: f76a4f2a65d3db7fd2737a057878748a4e700f03	Deviation	Status
flat 50k elements list	4052.35 ms	4105.6 ms	-1.2970%	✅
flat 50k elements list (P95 of main thread blocks)	69 ms	72 ms	-4.1667%	✅
grouping by label	9845.61 ms	9903.46 ms	-0.5841%	✅
grouping by label (P95 of main thread blocks)	65 ms	63 ms	3.1746%	🚨
grouping by class	9968.25 ms	10031.2 ms	-0.6275%	✅
grouping by class (P95 of main thread blocks)	40 ms	42 ms	-4.7619%	✅
grouping by property	10440.87 ms	10426.77 ms	0.1352%	🚨
grouping by property (P95 of main thread blocks)	82 ms	83 ms	-1.2048%	✅
grouping by base class (10 classes)	7220.89 ms	7314.39 ms	-1.2783%	✅
grouping by base class (10 classes) (P95 of main thread blocks)	72 ms	72 ms	0%	🟰
grouping by multiple attributes	26830.59 ms	26908.87 ms	-0.2909%	✅
grouping by multiple attributes (P95 of main thread blocks)	46 ms	67 ms	-31.3433%	✅
hide if no children required to finalize root, w/o children	46708.22 ms	45783.08 ms	2.0207%	🚨
hide if no children required to finalize root, w/o children (P95 of main thread blocks)	38 ms	38 ms	0%	🟰
hide if no children required to finalize root, w/ children	148.06 ms	160.84 ms	-7.9458%	✅
hide if no children required to finalize root, w/ children (P95 of main thread blocks)	0 ms	0 ms	NaN%	🚨
models tree initial (Baytown)	39.51 ms	38.8 ms	1.8299%	🚨
models tree initial (Baytown) (P95 of main thread blocks)	0 ms	0 ms	NaN%	🚨
models tree full (Baytown)	7575.45 ms	7659.77 ms	-1.1008%	✅
models tree full (Baytown) (P95 of main thread blocks)	88 ms	88 ms	0%	🟰

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