Build: Enable build config build feature for app

This is an AGP version '8.0' breaking change that changes the build
option default values, see build failure below:

------------------------------------------------------------------------

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':stories'.
> Failed to notify project evaluation listener.
   > com.android.builder.errors.EvalIssueException: Build Type 'debug'
    contains custom BuildConfig
    fields, but the feature is disabled.
   > Could not get unknown property 'release' for SoftwareComponent
    container of type org.gradle.api.internal.component
    .DefaultSoftwareComponentContainer.

------------------------------------------------------------------------

> Task :app:compileDebugKotlin FAILED
e: /Users/.../app/src/main/kotlin/org/wordpress/aztec/demo/
 MainActivity.kt: (680, 21): Unresolved reference: BuildConfig

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:compileDebugKotlin'.
> A failure occurred while executing org.jetbrains.kotlin.compilerRunner
 .GradleCompilerRunnerWithWorkers$GradleKotlinCompilerWorkAction
   > Compilation error. See log for more details

------------------------------------------------------------------------

Explanation: "Starting with AGP 8.0, the default values for these flags
have changed to improve build performance. AGP 8.0 doesn't generate
'BuildConfig' by default. You need to specify this option using the DSL
in the projects where you need it."

For more info see: https://developer.android.com/build/releases/
gradle-plugin#default-changes

Author: ParaskP7

app/build.gradle

@@ -32,6 +32,10 @@ android {
     lintOptions {
         disable 'GradleCompatible'
     }
+
+    buildFeatures {
+        buildConfig true
+    }
 }
 
 dependencies {