iOS: Support GDPR (APSAnalytics 2.1.0), add missing native header

[hansemannn]

JIRA: https://jira.appcelerator.org/browse/TIMOB-26004

Adding unit test once CR approved.

[garymathews]

I think we need to agree on the API specification for Ti.Analytics optOut because this is varying per implementation:

Ti.Analytics.optedOut // instead of Ti.Analytics.isOptedOut
Ti.Analytics.setOptedOut(boolean)
Ti.Analytics.getOptedOut()

For consistency like our other Titanium APIs

For example, the Windows implementation uses isOptOut:
https://github.com/appcelerator/titanium_mobile_windows/pull/1238

And Android uses optedOut:
#10058

[hansemannn]

@garymathews @ypbnv @infosia I have updated the iOS-PR to add the property optedOut with it's getter getOptedOut() and setter setOptedOut(true|false). I have also added the docs for iOS and Android - I think the "windows" platform tag needs to be added via the titanium_mobile_windows repo?

[infosia]

Updated Windows PR: https://github.com/appcelerator/titanium_mobile_windows/pull/1238 Updated API doc for Windows too.

[hansemannn]

@garymathews The PR was updated, can you re-review? I have also added @vijaysingh-axway for another CR.

[vijaysingh-axway]

@hansemannn Can you address the 2 points which I have mentioned. Thanks!

[vijaysingh-axway]

1. Isn't it good if we make this method's return type to (NSNumber *) for more readability and return it.
2. Following test case crashing, if I close the app and run again. Can this not be a test case ?
   `var win = Ti.UI.createWindow({
   backgroundColor: '#fff'
   });

var btn = Ti.UI.createButton({
title: 'Trigger'
});

btn.addEventListener('click', function() {
Ti.Analytics.setOptedOut(true);
});

win.add(btn);
win.open();
`

[hansemannn]

@garymathews @ypbnv Once Android is merged, we can update this one to work or all platforms.

@infosia I think this works on Windows already, since your tests have been pretty extensive before merging. Any objections? :-)

[vijaysingh-axway]

CR passed.

Dismissing review since the comments have been addressed earlier.