[FEATURE] Transport Import Stage - Extract and Serialize Objects

[ThePlenkov]

Transport Import Stage Implementation

Specification Reference: /specs/cicd/abap-cicd-pipeline.md - Transport Import Stage

Overview

Implement the transport import functionality that extracts and serializes all ABAP objects from transport requests.

Command Specification

adt import transport $TRANSPORT_NUMBER ./transport-content --format oat --debug

Requirements

• Extract all ABAP objects from transport request
• Support multiple output formats:
  • OAT format (primary)
  • abapGit format (compatibility)
  • JSON format (debugging)
• Detailed logging and troubleshooting support
• Error handling for invalid transport numbers
• Progress reporting for large transports

Technical Implementation

• ADT API integration for transport object retrieval
• ADK integration for type-safe object serialization
• OAT format output generation
• Comprehensive error handling and logging

Acceptance Criteria

• Successfully imports transport objects to specified directory
• Supports all specified output formats
• Provides clear progress indication and error messages
• Handles edge cases (empty transports, invalid IDs, network issues)
• Integration tests with real SAP system

Dependencies

• ADT CLI authentication system
• ADK object adapters
• OAT format specification