Add Azure Container Apps hosting detection

[zhenlan]

We can use CONTAINER_APP_NAME environment variable to detect Container Apps hosting environment.

Note that Container Apps run in Kubernetes, so KUBERNETES_PORT env variable is also present. Make sure to detect Container Apps before Kubernetes.

cc: @avanigupta @jimmyca15 @drago-draganov

[zhenlan]

cc @mrm9084 for the Java provider.