Schema for the VM payload config

Since we don't have a standard for JSON schema yet, protobuf is used
here to describe the schema for the VM payload config.

For now, it conveys
- version (1 for the current schema)
- os.name (microdroid is the only valid value )
- task.{command, args}
- apexes[].name (e.g. com.android.compos)

Bug: 186396080
Test: n/a
Change-Id: I576564922c7c838d919ad4efb128d7177cd8646f
1 file changed