[Architecture]add causal execution support

[davidrotari19]

Notable changes

• see CHANGELOG

Checklist

• keep a changelog
• write tests
• create tickets for TODO: <> statements
• create or update documentation

[codecov]

Codecov Report

❌ Patch coverage is 77.01056% with 849 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
sdk/src/nexus/crawler.rs	79.90%	223 Missing ⚠️
sdk/src/nexus/state.rs	79.57%	193 Missing ⚠️
sdk/src/test_utils/sui_mocks.rs	72.34%	78 Missing ⚠️
sdk/src/nexus/client.rs	68.90%	74 Missing ⚠️
sdk/src/nexus/registry.rs	57.03%	58 Missing ⚠️
sdk/src/sui/events/driver.rs	79.77%	53 Missing ⚠️
sdk/src/nexus/workflow.rs	58.53%	51 Missing ⚠️
sdk/src/nexus/tool.rs	31.37%	35 Missing ⚠️
sdk/src/sui.rs	73.95%	25 Missing ⚠️
sdk/src/events/query.rs	89.70%	14 Missing ⚠️
... and 7 more

📢 Thoughts on this report? Let us know!