camel-kafka-connector-generator-maven-plugin: implement a component exclusion mechanism

[valdar]

See: https://github.com/apache/camel-kafka-connector/blob/master/tooling/camel-kafka-connector-generator-maven-plugin/src/main/java/org/apache/camel/kafkaconnector/maven/GenerateCamelKafkaConnectorsMojo.java#L103

[oscerd]

Filter must stay