Add p5.strands bloom filter example to filter() reference

[LalitNarayanYadav]

Added Example: Bloom Effect on a Rotating 3D Cube using p5.strands

Description

This PR adds a new code example under the filter() reference that demonstrates how to apply a bloom (glow) effect using the p5.strands library. The example showcases a rotating 3D cube rendered in WEBGL mode with a subtle post-processing effect.

Code Summary

let strands;

function setup() {
  createCanvas(400, 400, WEBGL);
  strands = new Strands();
  strands.filter(bloom);
}

function draw() {
  strands.draw(() => {
    rotateY(millis() / 1000);
    normalMaterial();
    box(150);
  });
}

function bloom(input) {
  return input.blur(8).brighten(1.5).blend(input, ADD);
}

describe('A rotating 3D cube with a glow (bloom) effect using p5.strands.');

[LalitNarayanYadav]

fixes #7898