Feature/enhanced payment features

[alessandrobellesia]

Major features:

• Add Report API for payment/fee report generation (CSV, PDF, XLSX)
• Add Session API for POS integration with fund lock payments
• Extend Payment API with meal voucher and fringe benefits parameters
• Support euro-to-cent amount conversion in Payment.create() and Payment.update()
• Accept Date objects in Payment.all() for starting_after_timestamp parameter

API classes:

• Report: create(), all(), get() for merchant-level reports
• Session: open(), get(), update(), createEvent() for POS sessions
• Enhanced Payment types with meal_voucher_max_amount_unit and meal_voucher_max_quantity

TypeScript:

• Add ReportType, ReportFormatType, ReportStatus types
• Add SessionStatus, SessionEventType types
• Extend PaymentCreateBody and PaymentUpdateBody with meal voucher support
• Make amount/amount_unit mutually exclusive in payment types

Testing:

• Add 23 new unit tests for Report and Session classes (163 total passing)
• Add E2E test suite for staging environment integration testing
• Add setup helper functions for E2E test configuration
• Improve test coverage with edge cases and error handling

Documentation:

• Update CHANGELOG.md with comprehensive feature list
• Add examples for reports (reports.ts) and POS sessions (pos-session.ts)
• Update README with Reports, Sessions, and Meal Voucher sections

Fixes:

• Change Environment type from 'test' to 'staging' for consistency
• Fix Payment.all() return type from 'list' to 'data' (API compliance)
• Add proper SSL verification disable for staging environment

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