New DEX file format version 41 add support for "containers" - a way to store several logical DEX files in one physical file.

Official documentation: https://source.android.com/docs/core/runtime/dex-format#container

References to Google implementations:

• in Smali (read-only): google/smali@26f8136
• in platform/art: https://android.googlesource.com/platform/art/+/master/libdexfile/dex/dex_file.h#301

This issue create from discussion started in #2127