v0.3.0

• New minimum requirements: JDK 21, Kotlin 2.0, and Kotest 6.0. Check the release notes, and how to configure the extension.
• Removed formatAdventSpecNames configuration property. Formatting is automatically enabled when using the project extension.
• Advent specs are guaranteed to be executed chronologically when the project extension is registered.
• Spec definition now uses a dedicated DSL.
• Isolated debug runs can be configured from the DSL.