Plugin's include.gradle is not properly respected when building aar

Tell us about the problem

Currently {N} CLI detects if a plugin has any Android resources/java files/etc. and tries to build an android archive (.aar) for said plugin. During building of this .aar file CLI takes into account the plugin's include.gradle file, if it exists, however the logic for this is incomplete. Instead of only taking into account certain tags (like dependencies or repositories), it seems more appropriate that the whole include.gradle be included in the process of building the plugin's .aar file.

In other words instead of any additional parsing CLI should only include a
apply from: <path-to-plugin-include.gradle-file>

section in the plugin's build.gradle.

Which platform(s) does your issue occur on?

Android

Please tell us how to recreate the issue in as much detail as possible.

1. tns create myApp
2. cd myApp
3. tns plugin add nativescript-mapbox
4. edit node_modules/nativescript-mapbox/platforms/android/include.gradle so that the contents become:

android {
    productFlavors {
        "mapbox" {
            dimension "mapbox"
        }
    }
}

repositories {
    mavenCentral()
}

def coreLibrary = 'com.mapbox.mapboxsdk:mapbox-android-sdk:5.3.1@aar'
def serviceLibrary = 'com.mapbox.mapboxsdk:mapbox-android-services:2.2.9@aar'
def pluginsString = 'com.mapbox.mapboxsdk:mapbox-android-plugin-locationlayer:0.3.0'

// see https://www.mapbox.com/android-sdk/
dependencies {
    // core library
    compile ("$coreLibrary"){
        transitive=true
    }

    // service library
    compile ("$serviceLibrary"){
        transitive=true
    }

    // plugins
    compile "$pluginsString"
}

5. Try to execute tns build android

CLI fails to build the .aar file in this case, because the dependencies section is copied, however it is in its essence incomplete.

This is only a dummy example to illustrate the flaw in the CLI logic. The content of the include.gradle may contain more complex logic, which needs to be taken into account.

阅读 lib/services/android-plugin-build-service.ts 第 232-239 行附近的内容，然后使用 nativescript-mapbox 的 include.gradle 示例和 tns build android 重现该问题。跟踪 include.gradle 是如何纳入插件构建的；完成的标准是在构建 .aar 时应用完整文件，而不是只复制选定的部分。