[New] Run valve isolation trace

[des12437]

Description

This PR implements Run valve isolation trace in the Utility Network category.
URL to README: URL

Linked Issue(s)

• swift/issues/4067

How To Test

• Tap on one or more features to use as filter barriers or create and set the configuration's filter barriers by selecting a utility category.
• Toggle "Isolated Features" to update trace configuration.
• Tap "Trace" to run a subnetwork-based isolation trace.
• Tap "Reset" to clear filter barriers and trace results.

Screenshots

[des12437]

This PR is now ready for review. I broke up the view model into separate files and resolved all linter warnings.

[rolson]

I tried running this sample and I though I see this:

I'm unable to hit the Trace button without any barriers:

Something in the UX isn't correct it seems.

I'm also seeing a warning in the code:

The fix-it shows how to fix it by adding:

            @unknown default:

I also think the bottom toolbar still needs work. I'll try to understand the sample a little better and make a recommendation on that.

[rolson]

Can you make the "Category" button always say category and when you tap on it, you would see a checkmark next to the chosen category? I find the current behavior is not obvious. Also, there are some spacing issues when the text changes and it is animating in with an odd transition when it changes:

[rolson]

Another issue I see with this sample is that once I start adding barriers I have no way to reset. To me it seems like the reset button should be available once I start adding barriers. Thoughts?

[des12437]

Another issue I see with this sample is that once I start adding barriers I have no way to reset. To me it seems like the reset button should be available once I start adding barriers. Thoughts?

Good point. The old sample does not allow the filter barriers to be reset, but that should be supported. Since there is more toolbar real estate, perhaps having two separate buttons (Trace and Reset) to run or reset the trace would support this feature.

[yo1995]

First batch of comments.

[yo1995]

Thank you for writing this sample! It's been a great effort and while there are a few things that can be improved, overall it works well!

Only 1 remaining suggestion that causes a warning in the code.

[des12437]

Thank you both! @philium @yo1995