TextStyle property fontVariant not working on iOS

[cseelus]

Thanks for this neat little package to save some time.

Using the example from the README with Inter, fontVariant unfortunately has no effect on iOS (but on platform web).

...
fontFeatureSettings: "'zero' on, 'salt' on, 'ss01' on, 'ss03' on, 'cv01' on, 'cv07' on", // this is not supposed to work on `native`
fontVariant: ['common-ligatures', 'tabular-nums', 'slashed-zero'], // this is
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