WPTs for different CSS values of `width` and `height` for SVG elements

[goldenboy777]

This PR adds Web Platform Tests (WPTs) to verify the behavior of various CSS width and height values—such as auto, calc-size(), calc(), Ems, fit-content, inherit, initial, max-content, min-content, percent, Rems, stretch and viewport units like vw/vh—when applied to SVG elements. These tests aim to ensure consistent rendering across browsers and clarify expected layout behavior for SVGs styled with modern CSS sizing keywords.