Spiral Framework 3.0 support

What's Changed

• Added using RoadRunnerMode enum instead of EnvironmentInterface by @butschster in #16
• Added the ability to register activities and workflows for specific workers by @msmakouz in #21
• Added the ability to configure a temporal namespace by @kafkiansky in #29
• Allowed a developer to extend initialization by @roquie in #35

New Contributors

• @danielhomer made their first contribution in #22
• @roquie made their first contribution in #35

Full Changelog: 1.3.0...2.0.0