KAFKA-20882 Reduce build time: use lazy creation for Gradle tasks (i.e. use tasks.register instead of task or tasks.create)

[dejan2609]

JIRA ticket: KAFKA-20882

💡 How to test: execute ./gradlew clean releaseTarGz --rerun-tasks --no-build-cache --no-configuration-cache --no-daemon; results (on my box, that is):

• trunk: BUILD SUCCESSFUL in 4m 4s
• this PR: BUILD SUCCESSFUL in 3m 54s

⚠️ Note: allDepInsight task is producing equivalent (not identical) results; I made some tests comparing output files for both trunk and this PR:

./gradlew allDepInsight --configuration runtimeClasspath --dependency com.fasterxml.jackson.core:jackson-databind > someTxtFileForTrunkOrThisPR.txt

ℹ️ Some related links:

• https://docs.gradle.org/9.4.1/userguide/organizing_tasks.html
• https://docs.gradle.org/9.4.1/userguide/writing_tasks_intermediate.html
• https://docs.gradle.org/9.4.1/userguide/task_configuration_avoidance.html#task_configuration_avoidance
• https://docs.gradle.org/9.4.1/userguide/lazy_configuration.html
• https://docs.gradle.org/9.4.1/userguide/more_about_tasks.html
• https://docs.gradle.org/9.4.1/userguide/best_practices_tasks.html
• https://stackoverflow.com/questions/53654190/what-is-the-difference-between-registering-and-creating-in-gradle-kotlin-dsl