Detect & reports PackageTypes and nesting structures during conversion

To be able to support legacy deployment structures that mixed (initial & permission) content and application packages with application packages the converter should generate an analysis of the originally passed packages in a file reporting the following information:

• For each passed file report the nesting structures (including the paths within the hosting packages) including multilevel nesting
• For each found package & subpackage detect & report the Package Type (Application, Mixed, Content)
  • this should be detected from scratch as the optionally declared property is not reliable (might be a false declaration)
  • detectionlogic should follow filevault semantics (https://github.com/apache/jackrabbit-filevault/blob/6df76ba4a45316a84ec1cd10636296d191a82260/vault-core/src/main/java/org/apache/jackrabbit/vault/fs/io/AbstractExporter.java#L374-L399) but consider the type of nested packages - the jackrabbit implementation currently doesn't analyze subpackages but considers those as "content" as they are defined in "/etc"

This report should allow to detect any package that (either directly or in its nested containers) contains content (nothing in apps & libs) and indicate the location within the original package (potentially also requiring unpacking multiple nesting levels).

//simone.tripodi