Camel 4.9 - Add support for startup condition

[davsclaus]

Describe the feature here

https://issues.apache.org/jira/browse/CAMEL-21353

Here is how it was added to camel-spring-boot
apache/camel-spring-boot@ab83d59

And this jbang example should be able to export and run on CEQ

camel.startupcondition.enabled = true
camel.startupcondition.environment-variable-exists = FOO_BAR
camel.startupcondition.timeout = 60000
camel.main.name = dude

And the yaml route

- from:
    uri: "timer:yaml"
    parameters:
      period: "1000"
    steps:
      - setBody:
          simple: "Hello Camel from ${routeId}"
      - log: "${body}"