Adopt configuration-avoidance where possible

Before this change `./gradlew help` (with native enabled)
Created immediately: 1322
Created during configuration: 1541

after this change:
Created immediately: 596
Created during configuration: 1509

To know more about configuration avoidance: https://docs.gradle.org/current/userguide/task_configuration_avoidance.html

buildSrc/src/main/kotlin/pill/JpsCompatiblePlugin.kt

@@ -19,7 +19,7 @@ class JpsCompatiblePlugin : Plugin<Project> {
         project.configurations.create("jpsTest")
 
         if (project == project.rootProject) {
-            project.tasks.create("pill") {
+            project.tasks.register("pill") {
                 dependsOn(":pill:pill-importer:pill")
 
                 if (System.getProperty("pill.android.tests", "false") == "true") {
@@ -28,7 +28,7 @@ class JpsCompatiblePlugin : Plugin<Project> {
                 }
             }
 
-            project.tasks.create("unpill") {
+            project.tasks.register("unpill") {
                 dependsOn(":pill:pill-importer:unpill")
             }
         }