Feature/issue 590 591 592 593 event tests

[Coredevjay]

test: event emission tests for relayer, admin, and pause operations

Closes #590
closes #591
closes #592
closes #593

What

Adds typed event assertion tests for four contract operations that previously had no event coverage, and fixes the missing RelayerGranted emission.

Changes

lib.rs
— emit Event::RelayerGranted(relayer) in grant_relayer (resolves the TODO(#3) dependency required by #590)
contract_test.rs
:
Replace weak !events.is_empty() in grant_relayer_emits_relayer_granted_event with a typed Event::RelayerGranted(relayer) assertion (#590)
Add test_revoke_relayer_emits_event — asserts Event::RelayerRevoked(relayer) is the last event (#591)
Add test_transfer_admin_emits_event — asserts Event::AdminTransferred(old, new) and that get_admin() returns the new admin (#592)
Add test_pause_emits_event — asserts Event::ContractPaused(admin) is emitted on pause (#593)
Testing

All new tests follow the existing typed event pattern (event_data helper + (Event::Variant, ledger) comparison).

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