Zeebe Simple Monitor 0.19.0

Changelog

• show process state transitions in the audit log of the workflow instance view (#149)
• fix to import large message variables (#138)
• fix workflow instance view to highlight sequence flows (#143)
• (deps): bump zeebe-hazelcast-connector to 0.9.0 (using Hazelcast 4.0.1) (#145)
• (deps): bump spring-zeebe-starter to 0.23.0 (#135)