Improve interop with other JVM languages by annotating data classes with @JvmOverloads

Interop with other JVM languages would be improved if the [`@JvmOverloads`](https://kotlinlang.org/docs/java-to-kotlin-interop.html#overloads-generation) annotation was added to the library in places where default parameters are used, such as the following:

https://github.com/apple/pkl/blob/48ad4386c878b89dfaeef293490dd3398bbc4afc/pkl-codegen-java/src/main/kotlin/org/pkl/codegen/java/CliJavaCodeGeneratorOptions.kt#L22

https://github.com/apple/pkl/blob/48ad4386c878b89dfaeef293490dd3398bbc4afc/pkl-commons-cli/src/main/kotlin/org/pkl/commons/cli/CliBaseOptions.kt#L29

https://github.com/apple/pkl/blob/48ad4386c878b89dfaeef293490dd3398bbc4afc/pkl-commons-cli/src/main/kotlin/org/pkl/commons/cli/CliTestOptions.kt#L20

Start with CliJavaCodeGeneratorOptions.kt, CliBaseOptions.kt, and CliTestOptions.kt at the linked locations, then inspect nearby Kotlin data classes for default parameters. Add @JvmOverloads where appropriate so other JVM languages can use overloads, and verify that the affected public option constructors expose the expected overloads.

Written by the indexing model from the issue text.