E-ARK SIP parser (read support)

[boticas]

Introduces read/parse support for existing E-ARK SIP packages, complementing the existing write-only implementation.

What's changed:

• Added EARKMETSParser (and version-specific subclasses EARKMETSParser204, EARKMETSParser210) to deserialise METS XML and extract the E-ARK structural map.
• Added EARKReadUtils to walk the parsed METS (dmdSec, amdSec, fileSec, structMap) and populate the IP/SIP/IPRepresentation object graph, including checksum verification.
• Extended EARKSIP with a Parse method that accepts a ZIP path and returns a fully populated SIP with a ValidationReport.
• Added IReadStrategy/ZipReadStrategy and their factories for ZIP extraction, plus METSGeneratorFactory for profile-based parser selection.
• Added ZIPUtils, METSUtils.UnmarshalMETS, ValidationConstants, ValidationEntry, and ValidationReport supporting infrastructure.
• Extended the IP base class with members required by the parser (GetValidationReport, SetIds, SetCreateDate, etc.).
• Added Example 5 demonstrating SIP parsing from a ZIP file.
• Added parse tests and roundtrip tests covering the new read path.