Add support for processing claim adjustments in EDI 835 generator

[muthuka]

• Introduced LX segment for provider adjustments to define Loop 2000 structure.
• Enhanced CLP segment to handle optional patient responsibility amount.
• Added CAS segments for claim adjustments, including group codes, reason codes, and amounts.
• Implemented LQ segments for remittance advice remark codes associated with adjustments.
• Updated test2.json with comprehensive sample data for claims and adjustments.