Extract source api from app module (#8014)

* Extract source api from app module

* Extract source online api from app module

source-api/build.gradle.kts

@@ -0,0 +1,39 @@
+plugins {
+    id("com.android.library")
+    kotlin("android")
+    kotlin("plugin.serialization")
+}
+
+android {
+    namespace = "eu.kanade.tachiyomi.source"
+    compileSdk = AndroidConfig.compileSdk
+
+    defaultConfig {
+        minSdk = AndroidConfig.minSdk
+        targetSdk = AndroidConfig.targetSdk
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_1_8
+        targetCompatibility = JavaVersion.VERSION_1_8
+    }
+
+    kotlinOptions {
+        jvmTarget = JavaVersion.VERSION_1_8.toString()
+    }
+}
+
+dependencies {
+
+    implementation(project(":core"))
+
+    api(kotlinx.serialization.json)
+
+    api(libs.rxjava)
+
+    api(libs.preferencektx)
+
+    api(libs.jsoup)
+
+    implementation(androidx.corektx)
+}