KT-37950 Add io.ktor packages to 'Packages to use * import' list

- Ktor code style [here](https://ktor.io/quickstart/code-style.html)
suggests to use star imports for Ktor packages
- Absence of it in the default code style for Kotlin results in some
inconveniences during auto-import and autocompletion (see the issue)
- Automatic * import should mitigate the issue, since the first
autocompleted item from the proper package should import the whole
package, and then no further auto-import would be required for the
next completions
- KT-37950 Fixed

idea/formatter/src/org/jetbrains/kotlin/idea/core/formatter/KotlinCodeStyleSettings.java

@@ -80,6 +80,7 @@ public class KotlinCodeStyleSettings extends CustomCodeStyleSettings {
         if (!ApplicationManager.getApplication().isUnitTestMode()) {
             PACKAGES_TO_USE_STAR_IMPORTS.addEntry(new KotlinPackageEntry("java.util", false));
             PACKAGES_TO_USE_STAR_IMPORTS.addEntry(new KotlinPackageEntry("kotlinx.android.synthetic", true));
+            PACKAGES_TO_USE_STAR_IMPORTS.addEntry(new KotlinPackageEntry("io.ktor", true));
         }
 
         // Many of test data actually depend on this order of imports,