Auto import the Prefetch Library child dependencies

[sshann]

Currently, to use the Prefetch Library, developers must import an AAR file.
By default, it do not import the library child dependencies when importing the library to an Android project.

Further research this to see if it is possible directly via AAR file

There seems to be possible to import dependencies in the Prefetching Library via api instead of implement, thus allowing modules that import the library to have its child dependencies. Made a quick test but it didn't work. Verify why it failed / what is missing.

Reference links:

• How to fix 'java.lang.NoClassDefFoundError' in Android .aar project
• Add build dependencies