feat(TresCanvas): add dpr prop

[andretchen0]

Problem

Tres sets the renderer's pixelRatio automatically, but doesn't allow the developer to specify or influence the value.

Solution

Add a :dpr prop to <TresCanvas /> that:

• can be omitted, defaulting to current behavior.
• can be number: overriding the system's pixelRatio.
• can be [number, number], clamping the system's pixelRatio between the first (expected min) and second (expected max) values.

Playground

Playground demo added at:

http://localhost:5173/advanced/device-pixel-ratio

Meta

closes #765

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[alvarosabu]

You are awesome @andretchen0

[dghez]

just FYI, is missing on the docs https://docs.tresjs.org/api/tres-canvas.html

[dghez]

Left a new comment on the main thread #765 so i easier to track