feat(android): module build should add empty "build.gradle" if missing

[jquick-axway]

JIRA:
https://jira.appcelerator.org/browse/TIMOB-27770

Summary:
When building module with Titanium 9.0.0 and higher, module template's empty "build.gradle" file should be copied to project if missing. Reasons...

• Compel devs to use it for library dependencies when migrating module to 9.0.0.
• Appcelerator Studio needs a "clue" to identify folder as an Android project to resolve TISTUD-9204. Will fail to build/package module without it.

Test:

1. Download a zip of ti.imagefactory.
2. Unzip the module.
3. Open the "Terminal" and CD to: ./ti.imagefactory/android
4. Notice that there is no build.gradle file in this directory. (This is okay for now.)
5. In Terminal, enter: appc run -p android
6. Verify module builds and example project runs in emulator successfully.
7. Verify a build.gradle file was add to directory ./ti.imagefactory/android.
8. Open build.gradle file and add a code comment such as: // This is a test.
9. In Terminal, enter: appc run -p android --build-only
10. Open build.gradle file and verify comment is still there. (ie: Verify file was not overwritten.)

[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.
📖	❌ 2 tests have failed There are 2 tests failing and 703 skipped out of 7258 total tests.

Tests:

Classname	Name	Time	Error
android.emulator.Titanium.Android.Service	createService-background-interval (9)	10.008	Error: timeout of 10000ms exceeded at Titanium.<anonymous> (/ti-mocha.js:6535:53120)
android.emulator.Titanium.Android.Service	startService-background-interval (9)	16.849	Error: timeout of 10000ms exceeded at Titanium.<anonymous> (/ti-mocha.js:6535:53120)

Generated by 🚫 dangerJS against ececb9a

[garymathews]

CR: PASS

[lokeshchdhry]

FR Passed.

An empty build.gradle file is added to the module & its not overwritten.

Studio Ver: 6.0.0.201911251516
SDK Ver: 9.1.0 local build
OS Ver: 10.14.5
Xcode Ver: Xcode 11.3.1
Appc NPM: 5.0.0-2
Appc CLI: 8.0.0-master.9
Daemon Ver: 3.2.0
Ti CLI Ver: 5.2.2
Alloy Ver: 1.14.5
Node Ver: 12.13.1
NPM Ver: 6.12.1
Java Ver: 11.0.1
Emulator: Android 10