[I] Support Optional Android Dependencies For Plugin controlled via command line inputs [cordova-android]

["root-ansh (via GitHub)" <gi...@apache.org>]

root-ansh opened a new issue, #1862:
URL: https://github.com/apache/cordova-android/issues/1862

   # Feature Request
   Support Optional Android Dependencies For Plugin controlled via command line inputs
   
   ## Motivation Behind Feature
   This will allow us to develop cordova plugins that depend on multiple optional libraries. in android we can develop 2 separate libraries `a` & `b` , where `a` can check whether the user has included `b` library, and if so, can change its working accordingly.
   
   
   ## Feature Description
   in cordova, if i have defined the following preference in my plugin.xml:
   ```xml
   <preference name="FIREBASE_MESSAGING_VERSION" default="21.0.0"/>
   ```
   
   then the users of my plugin can pass this variable while adding the plugin as :
   ```
   cordova plugin add https://github.com/root-ansh/my-plugin --variable FIREBASE_MESSAGING_VERSION="20.4.0" 
   ```
   furthermore, in my plugin.xml , i am able to use this version as : 
   
   ```xml
   <framework src="com.google.firebase:firebase-messaging:$FIREBASE_MESSAGING_VERSION" />
   ```
   
   what we need is 
   1. to restrict user to use versions above `21.0.0` (which i think will be covered in next point)
   2. to have 'optional' depenedencies . like if i take a boolean variable `ADD_ANALYTICS_SDK` as input during plugin installation, then i should be able to add an additional , optional framework, something like this : 
   ```xml
   <rule>
       <if>
           <conditions>
               <condition var="ADD_ANALYTICS_SDK" >$ADD_ANALYTICS_SDK</condition>
           </conditions>
           <statements>
               <framework src="com.google.firebase:firebase-analytics:21.0.0" />
           </statements>
       </if>
   </rule>
   ```
   
   is something like this possible for `plugin.xml` ?
   


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