Add x, y options to Group createMultiple()

[samme]

This PR

• Adds a new feature

Adds x and y options to Group#createMultiple(). Values per GetAdvancedValue().

Examples

this.group.createMultiple({
    // …
    x: 100,
    y: 100
});

this.group.createMultiple({
    // …
    x: { randInt: [0, 800] },
    y: { randInt: [0, 600] },
});

this.group.createMultiple({
    // …
    x: [100, 200, 300, 400],
    y: [500, 600]
});

this.group.createMultiple({
    // …
    x: () => Phaser.Math.RND.weightedPick(X),
    y: () => Phaser.Math.RND.weightedPick(Y)
});

---

Note

Low Risk
Low risk, small additive change to Group#createFromConfig that only affects initial positions of newly created objects when x/y are provided; existing setXY behavior remains unchanged.

Overview
Adds support for per-object initial positioning in Group#createMultiple(). createFromConfig now reads x and y from the creation config via GetAdvancedValue and passes them into Group#create, enabling fixed, array-driven, or dynamic/randomized coordinates at creation time.

Updates the GroupCreateConfig typedef to document the new x/y options and their supported value types.

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