feat(ios): added event to detect that screenshot was taken

[vijaysingh-axway]

https://jira.appcelerator.org/browse/TIMOB-27853

[build]

	Fails
🚫	Tests have failed, see below for more information.

	Messages
📖	💾 Here's the generated SDK zipfile.
📖	✊ The commits in this PR match our conventions! Feel free to Rebase and Merge this PR when ready.
📖	❌ 1 tests have failed There are 1 tests failing and 709 skipped out of 7346 total tests.

Tests:

Classname	Name	Time	Error
ios.ipad.Titanium.UI.WebView	progress event (13.2.2)	0.833	Error: expected 'https://www.google.com/#spf=1588103422495' to be equals one of Array [ 'https://www.google.com/', 'https://www.google.com' ] fail@file:///Users/build/Library/Developer/CoreSimulator/Devices/F77CB658-56A6-4456-8790-32B676E15B36/data/Containers/Bundle/Application/947D5A20-D71F-4E31-AFF4-A826A27D516D/mocha.app/node_modules/should/cjs/should.js:275:19 value@file:///Users/build/Library/Developer/CoreSimulator/Devices/F77CB658-56A6-4456-8790-32B676E15B36/data/Containers/Bundle/Application/947D5A20-D71F-4E31-AFF4-A826A27D516D/mocha.app/node_modules/should/cjs/should.js:356:13 file:///Users/build/Library/Developer/CoreSimulator/Devices/F77CB658-56A6-4456-8790-32B676E15B36/data/Containers/Bundle/Application/947D5A20-D71F-4E31-AFF4-A826A27D516D/mocha.app/ti.ui.webview.test.js:733:28

Generated by 🚫 dangerJS against 8e60fd0

[ssjsamir]

FR Passed: Able to see the console indicate a screenshot has been taken, tested with the following test case:

var win = Ti.UI.createWindow({
    backgroundColor: '#fff'
});

win.open();

Ti.App.iOS.addEventListener('screenshotcaptured', function() {
    Ti.API.info('screenshot captured lol');
});

Test Environment

MacOS Catalina: 10.15.5 Beta
Xcode: 11.4
Java Version: 1.8.0_131
Android NDK: 21.1.6273396-beta2
Node.js: 10.16.3
""NPM":"5.0.0-1","CLI":"8.0.0-master.10""
iphone 13.4 SIM