camel-core - MainHelper load list from file in classpath to reduce memory

By static source code generate in java then we make the class take up memory space for string constants for all the component names. The class is about 20kb+ in size

As we only need this during bootstrap, we could source code generate to a .properties file and load this file from classpath into a set, and then clear the set after use. Then there is no memory being hold up.