Add js generate externals collecting statistics

#KT-39995 Fixed

idea/idea-core/src/org/jetbrains/kotlin/idea/statistics/FUSEventGroups.kt

@@ -35,6 +35,7 @@ enum class GradleStatisticsEvents {
     Kapt,
     CompilerPlugins,
     MPP,
+    JS,
     Libraries,
     GradleConfiguration,
     ComponentVersions,

idea/idea-gradle/src/org/jetbrains/kotlin/idea/statistics/KotlinGradleFUSLogger.kt

@@ -99,6 +99,11 @@ class KotlinGradleFUSLogger : StartupActivity, DumbAware, Runnable {
                 StringMetrics.JVM_DEFAULTS
             )
 
+            container.log(
+                GradleStatisticsEvents.JS,
+                BooleanMetrics.JS_GENERATE_EXTERNALS
+            )
+
             container.log(
                 GradleStatisticsEvents.MPP,
                 StringMetrics.MPP_PLATFORMS,

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/targets/js/dukat/DtsResolver.kt

@@ -5,10 +5,12 @@
 
 package org.jetbrains.kotlin.gradle.targets.js.dukat
 
+import org.jetbrains.kotlin.gradle.plugin.statistics.KotlinBuildStatsService
 import org.jetbrains.kotlin.gradle.targets.js.npm.NpmDependency
 import org.jetbrains.kotlin.gradle.targets.js.npm.NpmDependency.Scope.NORMAL
 import org.jetbrains.kotlin.gradle.targets.js.npm.NpmDependency.Scope.OPTIONAL
 import org.jetbrains.kotlin.gradle.targets.js.npm.NpmProject
+import org.jetbrains.kotlin.statistics.metrics.BooleanMetrics
 import java.io.File
 
 class DtsResolver(val npmProject: NpmProject) {
@@ -22,6 +24,7 @@ class DtsResolver(val npmProject: NpmProject) {
         externalNpmDependencies: Collection<NpmDependency>,
         considerGeneratingFlag: Boolean = true
     ): List<Dts> {
+        val buildStatsService = KotlinBuildStatsService.getInstance()
         return externalNpmDependencies
             .asSequence()
             .filter { !considerGeneratingFlag || it.generateExternals }
@@ -31,6 +34,9 @@ class DtsResolver(val npmProject: NpmProject) {
             }
             .sortedBy { it.inputKey }
             .toList()
+            .also {
+                buildStatsService?.report(BooleanMetrics.JS_GENERATE_EXTERNALS, it.isNotEmpty())
+            }
     }
 
     private fun getDtsFromDependency(

libraries/tools/kotlin-gradle-statistics/src/org/jetbrains/kotlin/statistics/metrics/BooleanMetrics.kt

@@ -38,6 +38,8 @@ enum class BooleanMetrics(val type: BooleanOverridePolicy, val anonymization: Bo
     KOTLIN_KTS_USED(OR, SAFE),
     JVM_COMPILER_IR_MODE(OR, SAFE),
 
+    JS_GENERATE_EXTERNALS(OR, SAFE),
+
     // User scenarios
     DEBUGGER_ENABLED(OVERRIDE, SAFE),
     COMPILATION_STARTED(OVERRIDE, SAFE),