Enable Gradle Configuration Cache

[Jolanrensen]

The Configuration Cache improves build performance by caching the result of the configuration phase and reusing it for subsequent builds.

https://docs.gradle.org/current/userguide/configuration_cache.html

Who knows how far we'll get to enabling configuration cache. Our project is quite complex after all... However, to improve build time, this would be a fantastic goal!

It probably needs to be broken down into smaller steps. For one, I know KoDEx doesn't yet support configuration cache. We will also need to revisit other interconnected dependencies of tasks and builds.

Current collection of warnings enabling configuration cache:

13 problems were found storing the configuration cache, 10 of which seem unique.
- Task `:core:changeJarTask` of type `org.gradle.api.DefaultTask`: cannot serialize Gradle script object references as these are not supported with the configuration cache.
- Task `:core:processKDocsMain` of type `nl.jolanrensen.kodex.gradle.RunKodexTask`: cannot serialize object of type 'org.gradle.api.internal.project.DefaultProject', a subtype of 'org.gradle.api.Project', as these are not supported with the configuration cache.
- Task `:dataframe-csv:changeJarTask` of type `org.gradle.api.DefaultTask`: cannot serialize Gradle script object references as these are not supported with the configuration cache.
- Task `:dataframe-csv:processKDocsMain` of type `nl.jolanrensen.kodex.gradle.RunKodexTask`: cannot serialize object of type 'org.gradle.api.internal.project.DefaultProject', a subtype of 'org.gradle.api.Project', as these are not supported with the configuration cache.
- Task `:plugins:dataframe-gradle-plugin:processIntegrationTestResources` of type `org.gradle.language.jvm.tasks.ProcessResources`: cannot serialize object of type 'org.gradle.api.internal.project.DefaultProject', a subtype of 'org.gradle.api.Project', as these are not supported with the configuration cache.
- Task `:plugins:dataframe-gradle-plugin:processResources` of type `org.gradle.language.jvm.tasks.ProcessResources`: cannot serialize object of type 'org.gradle.api.internal.project.DefaultProject', a subtype of 'org.gradle.api.Project', as these are not supported with the configuration cache.
- Task `:plugins:dataframe-gradle-plugin:processTestResources` of type `org.gradle.language.jvm.tasks.ProcessResources`: cannot serialize object of type 'org.gradle.api.internal.project.DefaultProject', a subtype of 'org.gradle.api.Project', as these are not supported with the configuration cache.
- Task `:plugins:expressions-converter:test` of type `org.gradle.api.tasks.testing.Test`: cannot serialize Gradle script object references as these are not supported with the configuration cache.
- Task `:plugins:kotlin-dataframe:test` of type `org.gradle.api.tasks.testing.Test`: cannot serialize Gradle script object references as these are not supported with the configuration cache.
- Task `:core:changeJarTask` of type `org.gradle.api.DefaultTask`: invocation of 'Task.project' at execution time is unsupported with the configuration cache.