v1.0.0-rc.4

What's Changed

• fix: impl serde for tracing context by @geofmureithi in #680
• chore: add dynamic workers, monitor and long-running examples by @geofmureithi in #681
• chore: expose TestWorker as stream by @geofmureithi in #682
• bump: to v1.0.0-rc.4 by @geofmureithi in #685

Full Changelog: v1.0.0-rc.3...v1.0.0-rc.4