PR Checklist

• The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/tools/notes/CONTRIBUTING.md#commit-messages.
• There is an issue for the bug/feature this PR is for. To avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it.
• You have signed the CLA.
• All existing tests are passing: https://github.com/NativeScript/NativeScript/blob/master/tools/notes/DevelopmentWorkflow.md#running-unit-tests-application.
• Tests for the changes are included - https://github.com/NativeScript/NativeScript/blob/master/tools/notes/WritingUnitTests.md.

What is the current behavior?

When using iosSymbolScale="large" the icon may appear oddly small. This is expected behavior based on how iOS system icons are handled as their scale is relative, not absolute.

What is the new behavior?

iOS system icon scale can be influenced by font-size and font-weight alongside scale to better control the desired size of the system icon.

For example, an Image like this:

<Image src="sys://steeringwheel.and.hands" iosSymbolScale="large" />

Would likely appear quite small, however we can now add font-size (as well as font-weight) to get a more appropriate size for desired usage:

<Image src="sys://steeringwheel.and.hands" iosSymbolScale="large" style="font-size: 45; font-weight: bold;" />

This can be applied via any css packages as well, like tailwind text-7xl font-bold would have same effect.
ref: https://developer.apple.com/documentation/uikit/configuring-and-displaying-symbol-images-in-your-ui