fix #1827 ComponentScan with SPEL will not parse

[qing-wq]

Fixes langchain4j/langchain4j#1827

fix ComponentScan basePackages with placeholders will not be parsed.

Changes Made:

• Support for parsing @componentscan with placeholders
• Simplify the getBasePackages()

[langchain4j]

@qing-wq thanks a lot! Could you please add a test that tests the situation in langchain4j/langchain4j#1827 (comment)? 🙏

[qing-wq]

I added new test cases and removed the redundant tests about SpringBootApplication, which was not required

[langchain4j]

@qing-wq thanks! Why removing existing tests though?

[qing-wq]

I've learned that @SpringBootApplication is essentially an alias for @ComponentScan, so I don't think we need to test it alone, just@ComponentScan：

@AliasFor(annotation = ComponentScan.class, attribute = "basePackages")
String[] scanBasePackages() default {};

@AliasFor(annotation = ComponentScan.class, attribute = "basePackageClasses")
Class<?>[] scanBasePackageClasses() default {};

[langchain4j]

@qing-wq I would still keep it, assuming there is no harm and test is fast

[qing-wq]

I understand, and I canceled my modification

[langchain4j]

@qing-wq please check the tests, they all failed.

[qing-wq]

sorry, there are some errors in my test code, but now I have fixed it.

[langchain4j]

@qing-wq thank you!