test: add integration test asserting require_not_paused blocks mutating calls (#227)

[the-Devdrago]

Description

This PR adds an integration test suite for the compliance-pausable crate asserting that require_not_paused actually blocks every state-mutating entrypoint in consumer contracts while paused, allows read-only calls while paused, and permits mutations once unpaused.

Changes Implemented

• Added contracts/pausable/tests/require_not_paused_integration.rs containing:
  • A table-driven test suite exercising every state-mutating entrypoint (set_flag, record_data, batch_update, transfer_value, update_setting) on a representative consumer contract while paused and asserting each one returns Err(ContractPaused).
  • Verification that all read-only methods (get_flag, get_record, get_balance, get_setting, is_paused) remain unblocked while paused.
  • Verification that mutating entrypoints resume successfully after unpause().
  • A negative-testing verification on a flawed consumer contract confirming that any mutating entrypoint that forgets require_not_paused causes an immediate, obvious test failure.
  • Instance storage isolation test verifying pause state does not leak between contract instances.
• Added contracts/pausable to workspace members in Cargo.toml.

Closes #227

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