Harmonize and document restrictions and their meaning in different adapters.

```
const val ACTIVITY_ID = "activityId"
const val BUSINESS_KEY = "businessKey"
const val CORRELATION_KEY = "correlationKey"
const val PROCESS_DEFINITION_KEY = "processDefinitionKey"
const val PROCESS_INSTANCE_ID = "processInstanceId"
const val PROCESS_DEFINITION_ID = "processDefinitionId"
const val PROCESS_DEFINITION_VERSION_TAG = "processDefinitionVersionTag"
const val TASK_DEFINITION_KEY = "taskDefinitionKey"
const val TENANT_ID = "tenantId"
const val WITHOUT_TENANT_ID = "withoutTenantId"
const val MESSAGE_ID = "messageId"
const val MESSAGE_TTL = "messageTTL"
const val EXECUTION_ID = "executionId"
```

Document those guys...