Devops: KTLint to lint Kotlin code (#6)

* Adds KTLint as a GitHub action
* Adds KTLint to the gradle project for IDE integration
* Adds .editorconfig to configure KTLint (android/)

android/build.gradle

@@ -15,12 +15,15 @@ buildscript {
     // noinspection DifferentKotlinGradleVersion
     classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     classpath "org.jetbrains.kotlin:kotlin-android-extensions:$kotlin_version"
+    // ktlint
+    classpath "org.jlleitschuh.gradle:ktlint-gradle:10.0.0"
   }
 }
 
 apply plugin: 'com.android.library'
 apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-android-extensions'
+apply plugin: 'org.jlleitschuh.gradle.ktlint'
 
 def getExtOrDefault(name) {
   return rootProject.ext.has(name) ? rootProject.ext.get(name) : project.properties['VisionCamera_' + name]