test: Remittance Events

[anonfedora]

feat: Add event emission and enhanced type derivations for RemittanceSplit contract

Summary

Closes #66

This PR adds structured event emission throughout the RemittanceSplit contract, improves type derivations for contract types, and expands test coverage for event-driven behavior.

Changes

Contract (lib.rs)

• Added Debug, Eq, and PartialEq derives to SplitInitializedEvent, SplitCalculatedEvent, SplitConfig, and SplitEvent for better testability and debugging.
• Added initialized: bool field to SplitConfig and SplitCalculatedEvent to track initialization state explicitly.
• Added timestamp field population in initialize_split and calculate_split to ensure all emitted events carry ledger time context.
• Migrated inline test module out of lib.rs into test.rs to keep the contract file clean.

Tests (test.rs)

• Added Events, IntoVal, Symbol, TryFromVal, and Val to test imports.
• Added three new event-specific tests:
  • test_initialize_split_events — verifies topic structure and data payload on split initialization.
  • test_update_split_events — verifies the SplitEvent::Updated topic and caller data on split update.
  • test_calculate_split_events — verifies the SplitEvent::Calculated topic and total_amount data payload on split calculation.

Testing

All existing tests continue to pass. New tests verify event topics and data payloads using try_from_val deserialization to ensure type-safe event assertions.

[Baskarayelu]

fix the pipeline @anonfedora

[anonfedora]

Fixed @Baskarayelu

[Baskarayelu]

LGTM