Remove lombok & include easy-rag starter

[TFyre]

Issue

No specific issue

Change

• remove lombok
  Replace lombok with java records. This reduces dependencies and avoid build problems with newer versions of the JDK

• include easy-rag starter
  easy-rag is not currently published. This is due to not being included in the pom or bom. Include it in the pom so that it will be deployed as a module and included in the bom.

General checklist

• There are no breaking changes
• I have added unit and/or integration tests for my change
• The tests cover both positive and negative cases
• I have manually run all the unit and integration tests in the module I have added/changed, and they are all green

• I have added/updated the documentation
• I have added an example in the examples repo (only for "big" features)

Checklist for adding new Spring Boot starter

• I have added my new starter in the root pom.xml
• I have added a org.springframework.boot.autoconfigure.AutoConfiguration.imports file in the langchain4j-{integration}-spring-boot-starter/src/main/resources/META-INF/spring/ directory

[TFyre]

This might be considered as breaking changes due to record changes. How should this be handled?

[TFyre]

any feedback here?