Add option to maintain aspect ratio on resize (#971)
* Add option to resize one dimension and maintain aspect ratio.
* Update src/utils/image.js
Reduce function calls for optimisation.
Co-authored-by: Joshua Lochner <admin@xenova.com>
* Optimise image utils tests.
* nullish dimension may be `null`, `undefined`, or `-1`
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Co-authored-by: Joshua Lochner <admin@xenova.com>
