convention plugin

[benckx]

No description provided.

[Copilot]

Pull request overview

This PR introduces a buildSrc module to host Gradle Kotlin DSL helper functions, and updates the root build script to rely directly on the libs version-catalog accessors. This centralizes build-logic helpers and removes ad-hoc buildscript aliases.

Changes:

• Added buildSrc with the kotlin-dsl plugin and mavenCentral() repository.
• Moved dependency helper extensions (api, implementation, compileOnly, testImplementation) out of build.gradle.kts into buildSrc.
• Replaced rootLibs alias usage with direct libs usage throughout the root build script.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
buildSrc/src/main/kotlin/DependencyHelpers.kt	Adds shared dependency-DSL helper extensions for use across build scripts.
buildSrc/build.gradle.kts	Defines the buildSrc build (kotlin-dsl + repositories) so helper code is compiled and available.
build.gradle.kts	Removes inline helper functions/alias and switches dependency references to libs.

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