feat(ios): switch from spinner to progress bar

[GitToTheHub]

Platforms affected

iOS

Motivation and Context

• PR feat(android): add progress bar #1169 implemented a progress bar for Android. Today it's more common to use a progress bar instead of a spinner to indicate loading of web page as it is the default for the Safari app. This aligns it with Android and use the same option hideloadingindicator as for Android. The old option hidespinner is still supported and will be an alias for hideloadingindicator.

Sample

iOS 26.5 iPhone 17 Pro Simulator

Description

Testing

Checklist

• I've run the tests to see all new and existing tests pass
• I added automated test coverage as appropriate for this change
• Commit is prefixed with (platform) if this change only applies to one platform (e.g. (android))
• If this Pull Request resolves an issue, I linked to the issue in the text above (and used the correct keyword to close issues using keywords)
• I've updated the documentation if necessary

[GitToTheHub]

If no one has any objections, I would merge this