Fix: Support all WebGL2 TypedArray types in convertPixels

[Determinated738]

This PR fixes an issue where when you pass a TypedArray such as Uint32Array to gl.texImage2D, the convertPixels fails and returns null, resulting in the cpp side getting null and defaulting to all 0s.

Minimal code to recreate the bug:

const gl = createGL(64, 64, { createWebGL2Context: true });
const tex = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, tex);
const inputData = new Uint32Array([10, 20, 30, 40]);
// This should succeed in WebGL2, but the headless driver rejects it.
gl.texImage2D(
    gl.TEXTURE_2D,
    0,
    gl.RGBA32UI,
    1,
    1,
    0,
    gl.RGBA_INTEGER,
    gl.UNSIGNED_INT,
    inputData,
);

const fbo = gl.createFramebuffer();
gl.bindFramebuffer(gl.FRAMEBUFFER, fbo);
gl.framebufferTexture2D(
    gl.FRAMEBUFFER,
    gl.COLOR_ATTACHMENT0,
    gl.TEXTURE_2D,
    tex,
    0,
);
const readback = new Uint32Array(4);
gl.readPixels(0, 0, 1, 1, gl.RGBA_INTEGER, gl.UNSIGNED_INT, readback);
console.log("Expected output:", inputData);
console.log("Actual readback:", readback);

Changes:

Updated src/javascript/utils.js to use the isTypedArray helper function in convertPixels. To support all the standard TypedArray types.