Compile secondary dex files in DexManager

Add logic for secondary dex compilation in DexManager. Also, extend the
`cmd package compile` command with '--secondary-dex' option which will
compile all used secondary dex files for the given package.

Test: flash & boot,
      cmd package compile --secondary-dex -f -m speed
com.google.android.gms
Bug: 32871170

Change-Id: Ia2b95cb70d26c4ead5cb650047641b0881ca84ae