Refactor gradle configuration and update dependencies

- Enable java 11 language features
- Switch to groovy syntax
- Switch to new gradle plugins and dependency configuration
- Drop deprecated properties
- Switch from buildscript to project.ext closure for version property
- Update dependencies to latest stable versions
- Address build errors arising due to dependencies update

Signed-off-by: Aayush Gupta <aayushgupta219@gmail.com>

gradle.properties

@@ -46,9 +46,6 @@ kapt.incremental.apt=true
 android.databinding.incremental=true
 android.lifecycleProcessor.incremental=true
 
-# Decrease gradle builds time
-kapt.use.worker.api=true
-
 # turn off AP discovery in compile path, and therefore turn on Compile Avoidance
 kapt.include.compile.classpath=false