build: convert build.gradle from Groovy to Kotlin DSL

[soloturn]

Description

Converts the repo's build.gradle from Groovy DSL to Kotlin DSL (build.gradle -> build.gradle.kts). No intended behavior change. Companion to MovingBlocks/DestinationSol#737.

Notable non-mechanical changes

• com.android.application is applied via apply(plugin = ...) rather than the plugins{} block (its version comes from the buildscript classpath, not the plugin portal), so the type-safe android{} accessor is never generated. Configured the extension explicitly via configure<ApplicationExtension>{} instead — and specifically the modern com.android.build.api.dsl.ApplicationExtension, not the legacy com.android.build.gradle.AppExtension: AGP 9.x defaults to android.newDsl=true, under which only the modern extension gets registered as a project extension at all.
• Several android{} DSL calls that Groovy's dynamic typing let slide are ERROR-level deprecated from Kotlin (AGP marks them @Deprecated(level = ERROR), which Groovy's dynamic dispatch never checks but Kotlin enforces as a hard compile failure): sourceSet .setSrcDirs() → the directories mutable set, packagingOptions{} → packaging{}, its top-level excludes/merges/pickFirsts → nested under resources., lintOptions{}'s isAbortOnError → lint{}'s abortOnError, and the group/name/version dependency notation → single-string notation.
• Two genuine Kotlin-only pitfalls from property-name collisions: inside defaultConfig{}/android{}, bare references to compileSdk/minSdk/targetSdk resolve to those DSL blocks' own (nullable, initially-unset) same-named properties rather than this script's top-level vals of the same name, since Kotlin's implicit-receiver member lookup shadows the outer scope. Groovy's dynamic property resolution doesn't have this failure mode. Renamed the top-level vals to compileSdkNumber/minSdkNumber/targetSdkNumber to make the two unambiguous.
• signingConfigs { release { ... } } relies on Groovy's container DSL sugar to create the "release" signing config, since none exists by default (unlike buildTypes, where "release" is a default AGP build type). Kotlin's getByName() requires it to already exist and throws; switched to create("release").
• AndroidComponentsExtension<*, *, *> (the generic base type) isn't registered as a project extension; only the concrete ApplicationAndroidComponentsExtension is, for application modules.

Testing

Verified end-to-end against a real Android SDK (not just a compile-only smoke test): built a local copy of this build.gradle.kts into a Kotlin DSL-converted checkout of DestinationSol (MovingBlocks/DestinationSol#737) and ran gradlew :android:compileDebugJavaWithJavac successfully, in addition to :android:help configuring the full variant/module-dexing task graph (androidComponents{}, per-module dex/export tasks) without error.

[coderabbitai]

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