Add node hierarchy benchmarks

[myaaaaaaaaa]

Benchmarks different patterns of creating node hierarchies and freeing them. Depends on #22

Implements two of the benchmarks from #11:

Core

• Create 100,000 nodes (flat)
• Create 100,000 nodes (nested as deep as possible)

[Calinou]

Tested locally, it works. Local results for reference:

{
	"benchmarks": [
		{
			"category": "Gdscript > Alloc",
			"name": "Deep Tree",
			"results": {
				"idle": 0,
				"physics": 0,
				"render_cpu": 0,
				"render_gpu": 0,
				"time": 144
			}
		},
		{
			"category": "Gdscript > Alloc",
			"name": "Duplicate",
			"results": {
				"idle": 0,
				"physics": 0,
				"render_cpu": 0,
				"render_gpu": 0,
				"time": 975
			}
		},
		{
			"category": "Gdscript > Alloc",
			"name": "Fragmentation",
			"results": {
				"idle": 0,
				"physics": 0,
				"render_cpu": 0,
				"render_gpu": 0,
				"time": 1641
			}
		},
		{
			"category": "Gdscript > Alloc",
			"name": "Wide Tree",
			"results": {
				"idle": 0,
				"physics": 0,
				"render_cpu": 0,
				"render_gpu": 0,
				"time": 103
			}
		},
		{
			"category": "Gdscript > Array",
			"name": "Packed String Array",
			"results": {

			}
		},
		{
			"category": "Gdscript > Array",
			"name": "Typed Int Array",
			"results": {

			}
		},
		{
			"category": "Gdscript > Array",
			"name": "Typed String Array",
			"results": {

			}
		},
		{
			"category": "Gdscript > Array",
			"name": "Untyped Int Array",
			"results": {

			}
		},
		{
			"category": "Gdscript > Array",
			"name": "Untyped String Array",
			"results": {

			}
		},
		{
			"category": "Rendering > Culling",
			"name": "Basic Cull",
			"results": {

			}
		},
		{
			"category": "Rendering > Culling",
			"name": "Directional Light Cull",
			"results": {

			}
		},
		{
			"category": "Rendering > Culling",
			"name": "Dynamic Cull",
			"results": {

			}
		},
		{
			"category": "Rendering > Culling",
			"name": "Dynamic Light Cull",
			"results": {

			}
		},
		{
			"category": "Rendering > Culling",
			"name": "Dynamic Light Cull With Shadows",
			"results": {

			}
		},
		{
			"category": "Rendering > Culling",
			"name": "Static Light Cull",
			"results": {

			}
		},
		{
			"category": "Rendering > Polygon 2d",
			"name": "1000 Polygon 2d",
			"results": {

			}
		},
		{
			"category": "Rendering > Polygon 2d",
			"name": "100 Polygon 2d",
			"results": {

			}
		},
		{
			"category": "Rendering > Polygon 2d",
			"name": "10 Polygon 2d",
			"results": {

			}
		},
		{
			"category": "Rendering > Polygon 2d",
			"name": "5000 Sprite 2d",
			"results": {

			}
		},
		{
			"category": "Rendering > Polygon 2d",
			"name": "500 Sprite 2d",
			"results": {

			}
		},
		{
			"category": "Rendering > Polygon 2d",
			"name": "50 Sprite 2d",
			"results": {

			}
		}
	],
	"engine": {
		"binary_size": 116431872,
		"build_type": "editor",
		"version": "v4.0.2.stable.official",
		"version_hash": "7a0977ce2c558fe6219f0a14f8bd4d05aea8f019"
	},
	"system": {
		"cpu_architecture": "x86_64",
		"cpu_count": 32,
		"cpu_name": "13th Gen Intel(R) Core(TM) i9-13900K",
		"gpu_name": "NVIDIA GeForce RTX 4090",
		"gpu_vendor": "NVIDIA",
		"os": "Linux"
	}
}

Thanks!