Remove the build-logic module

Summary:
As now we have a single module to publish, I'm removing the build-logic folder and moving everything inside the java/build.gradle file.
I've also converted it to Kotlin,

Reviewed By: NickGerleman

Differential Revision: D47259204

fbshipit-source-id: 2378d9e9598d7816f230db5f763f2b0f4cdf01d0

build.gradle

@@ -38,16 +38,6 @@ nexusPublishing {
     }
 }
 
-ext {
-    buildToolsVersion = "33.0.0"
-    ndkVersion = "23.1.7779620"
-    minSdkVersion = 21
-    compileSdkVersion = 33
-    targetSdkVersion = 33
-    sourceCompatibilityVersion = JavaVersion.VERSION_1_8
-    targetCompatibilityVersion = JavaVersion.VERSION_1_8
-}
-
 task clean(type: Delete) {
     delete rootProject.buildDir
 }