Add Mandelbrot set and Lua ported algorithm benchmarks

[OverloadedOrama]

Adds these benchmarks from #36:

• 🟪Algorithm🟪 [Calculate Mandlebrot set]: GDscript: for fixed size image, and time it.
• 🟪Algorithm🟪 [Port these benchmarks]: GDscript: https://programming-language-benchmarks.vercel.app/lua

6 new benchmarks have been added:

Name	Input 1	Input 2	Input 3
Mandelbrot set algorithm	600x400 image, 1000 iterations
Binary trees	15	18
Hello world
Merkle trees	13	15
Nbody	500000	1000000
Spectral norm	100	500	1000

For the merkle trees, nbody and spectral norm benchmarks, I decided to give inputs lower than those in https://programming-language-benchmarks.vercel.app/lua, as GDScript was taking too long to finish them.

Results on my PC

{
"benchmarks": [
{
"category": "Gdscript > Binary Trees",
"name": "Binary Trees 15",
"results": {
"time": 2911
}
},
{
"category": "Gdscript > Binary Trees",
"name": "Binary Trees 18",
"results": {
"time": 27350
}
},
{
"category": "Gdscript > Hello World",
"name": "Hello World",
"results": {
"time": 0.054
}
},
{
"category": "Gdscript > Mandelbrot Set",
"name": "Mandelbrot Set",
"results": {
"time": 10890
}
},
{
"category": "Gdscript > Merkle Trees",
"name": "Merkle Trees 13",
"results": {
"time": 4463
}
},
{
"category": "Gdscript > Merkle Trees",
"name": "Merkle Trees 15",
"results": {
"time": 26240
}
},
{
"category": "Gdscript > Nbody",
"name": "Nbody 1 000 000",
"results": {
"time": 16890
}
},
{
"category": "Gdscript > Nbody",
"name": "Nbody 500 000",
"results": {
"time": 8322
}
},
{
"category": "Gdscript > Spectral Norm",
"name": "Spectral Norm 100",
"results": {
"time": 4488
}
},
{
"category": "Gdscript > Spectral Norm",
"name": "Spectral Norm 1000",
"results": {
"time": 17880
}
},
{
"category": "Gdscript > Spectral Norm",
"name": "Spectral Norm 500",
"results": {
"time": 18680
}
}
],
"engine": {
"version": "v4.3.beta1.official",
"version_hash": "a4f2ea91a1bd18f70a43ff4c1377db49b56bc3f0"
},
"system": {
"cpu_architecture": "x86_64",
"cpu_count": 12,
"cpu_name": "AMD Ryzen 5 1600 Six-Core Processor",
"os": "Linux"
}
}

[Calinou]

Tested locally, it works as expected.

Thanks!