Maven central publish (#1086)

Summary:
Sets up the plugins necessary to publish to Maven Central.

Pull Request resolved: https://github.com/facebook/yoga/pull/1086

Test Plan: ./gradlew publishToMavenLocal -PRELEASE_SIGNING_ENABLED=false

Reviewed By: mweststrate

Differential Revision: D28604529

Pulled By: passy

fbshipit-source-id: 2c35b94ce0e254bc7a8bc80e449ac5dadb5def38

build.gradle

@@ -14,6 +14,7 @@ buildscript {
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:4.2.1'
+        classpath 'com.vanniktech:gradle-maven-publish-plugin:0.15.1'
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
     }
@@ -22,7 +23,7 @@ buildscript {
 allprojects {
   repositories {
     google()
-    jcenter()
+    mavenCentral()
   }
 }