I would prefer to see the common as a library only, with no dependency on mIcrostream.
Just the Configuration java classes.
For the safety of future use, it's better if there are as few dependencies as possible.
I would leave the dependency on Microstream and other spring components to the implementation.

@zdenek-jonas As discussed, the PR without spring-boot-common module.

Spring must add this dependency to generate the metadata file from custom configuration fields. This file is essential for IDE (such as IntelliJ) to enable context suggestions for developers. To add

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-configuration-processor</artifactId>
            <version>${org.springframework.boot.version}</version>
            <scope>provided</scope>
            <optional>true</optional>
        </dependency>

And also please add enforce plugin to check if this file exists (like spring boot 2)

Some more information about:
https://docs.spring.io/spring-boot/docs/current/reference/html/configuration-metadata.html#appendix.configuration-metadata.annotation-processor