Improve the relevance of code completion list

[testforstephen]

When typing 'List' in the spring-petclinic project, the commonly used class java.util.List does not appear at the top of the completion list, which can be confusing for users. To address this, we suggest introducing a mechanism such as a favorite completion list to influence the completion relevance. By adding commonly used classes from java.util.* to the favorite list, they can be prioritized and appear at the top of the completion list.