Make build-logic extension internal

Those extensions *will* be accessible in build.gradle.kts if not made internal.
They are used to configure the conventions plugins internally.
They should not be accessible by the consumer Gradle modules.

build-logic/convention/src/main/kotlin/com/google/samples/apps/nowinandroid/AndroidCompose.kt

@@ -25,7 +25,7 @@ import org.gradle.kotlin.dsl.getByType
 /**
  * Configure Compose-specific options
  */
-fun Project.configureAndroidCompose(
+internal fun Project.configureAndroidCompose(
     commonExtension: CommonExtension<*, *, *, *>,
 ) {
     val libs = extensions.getByType<VersionCatalogsExtension>().named("libs")

build-logic/convention/src/main/kotlin/com/google/samples/apps/nowinandroid/Jacoco.kt

@@ -36,7 +36,7 @@ private val coverageExclusions = listOf(
     "**/Manifest*.*"
 )
 
-fun Project.configureJacoco(
+internal fun Project.configureJacoco(
     androidComponentsExtension: AndroidComponentsExtension<*, *, *>,
 ) {
     val libs = extensions.getByType<VersionCatalogsExtension>().named("libs")

build-logic/convention/src/main/kotlin/com/google/samples/apps/nowinandroid/KotlinAndroid.kt

@@ -28,7 +28,7 @@ import org.jetbrains.kotlin.gradle.dsl.KotlinJvmOptions
 /**
  * Configure base Kotlin with Android options
  */
-fun Project.configureKotlinAndroid(
+internal fun Project.configureKotlinAndroid(
     commonExtension: CommonExtension<*, *, *, *>,
 ) {
     commonExtension.apply {