Fix ANR/Crash on autoconsent init handler (#6354)

Task/Issue URL:
https://app.asana.com/1/137249556945/project/488551667048375/task/1210704553451145?focus=true

### Description
This PR tries to fix and ANR and crash in the autoconsent init handler.
It does remove the call to trimIndent() which is not very performant for
long strings (and doesn't seem to be needed) and it moves all the logic
to IO leaving only the webview call to evaluate JS in main.

### Steps to test this PR

- [ ] Test autoconsent

Author: marcosholgado

autoconsent/autoconsent-impl/src/main/java/com/duckduckgo/autoconsent/impl/handlers/InitMessageHandlerPlugin.kt

@@ -35,6 +35,7 @@ import com.squareup.moshi.Moshi
 import javax.inject.Inject
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.launch
+import kotlinx.coroutines.withContext
 import logcat.logcat
 
 @ContributesMultibinding(AppScope::class)
@@ -49,7 +50,7 @@ class InitMessageHandlerPlugin @Inject constructor(
 
     override fun process(messageType: String, jsonString: String, webView: WebView, autoconsentCallback: AutoconsentCallback) {
         if (supportedTypes.contains(messageType)) {
-            appCoroutineScope.launch(dispatcherProvider.main()) {
+            appCoroutineScope.launch(dispatcherProvider.io()) {
                 try {
                     val message: InitMessage = parseMessage(jsonString) ?: return@launch
                     val url = message.url
@@ -82,7 +83,9 @@ class InitMessageHandlerPlugin @Inject constructor(
 
                     val response = ReplyHandler.constructReply(getMessage(initResp))
 
-                    webView.evaluateJavascript("javascript:$response", null)
+                    withContext(dispatcherProvider.main()) {
+                        webView.evaluateJavascript("javascript:$response", null)
+                    }
                 } catch (e: Exception) {
                     logcat { e.localizedMessage }
                 }

autoconsent/autoconsent-impl/src/main/java/com/duckduckgo/autoconsent/impl/handlers/ReplyHandler.kt

@@ -18,10 +18,6 @@ package com.duckduckgo.autoconsent.impl.handlers
 
 object ReplyHandler {
     fun constructReply(message: String): String {
-        return """
-            (function() {
-                window.autoconsentMessageCallback($message, window.origin);
-            })();
-        """.trimIndent()
+        return "(function() {window.autoconsentMessageCallback($message, window.origin);})();"
     }
 }

autoconsent/autoconsent-impl/src/test/java/com/duckduckgo/autoconsent/impl/RealAutoconsentTest.kt

@@ -117,11 +117,7 @@ class RealAutoconsentTest {
 
     @Test
     fun whenSetAutoconsentOptOutThenEvaluateJavascriptCalled() {
-        val expected = """
-        javascript:(function() {
-            window.autoconsentMessageCallback({ "type": "optOut" }, window.origin);
-        })();
-        """.trimIndent()
+        val expected = """javascript:(function() {window.autoconsentMessageCallback({ "type": "optOut" }, window.origin);})();"""
 
         autoconsent.setAutoconsentOptOut(webView)
         assertEquals(expected, shadowOf(webView).lastEvaluatedJavascript)

autoconsent/autoconsent-impl/src/test/java/com/duckduckgo/autoconsent/impl/handlers/EvalMessageHandlerPluginTest.kt

@@ -118,8 +118,8 @@ class EvalMessageHandlerPluginTest {
 
     private fun jsonToEvalResp(json: String): EvalResp? {
         val trimmedJson = json
-            .removePrefix("javascript:(function() {\n    window.autoconsentMessageCallback(")
-            .removeSuffix(", window.origin);\n})();")
+            .removePrefix("javascript:(function() {window.autoconsentMessageCallback(")
+            .removeSuffix(", window.origin);})();")
         val moshi = Moshi.Builder().add(JSONObjectAdapter()).build()
         val jsonAdapter: JsonAdapter<EvalResp> = moshi.adapter(EvalResp::class.java)
         return jsonAdapter.fromJson(trimmedJson)

autoconsent/autoconsent-impl/src/test/java/com/duckduckgo/autoconsent/impl/handlers/InitMessageHandlerPluginTest.kt

@@ -242,8 +242,8 @@ class InitMessageHandlerPluginTest {
 
     private fun jsonToInitResp(json: String): InitResp? {
         val trimmedJson = json
-            .removePrefix("javascript:(function() {\n    window.autoconsentMessageCallback(")
-            .removeSuffix(", window.origin);\n})();")
+            .removePrefix("javascript:(function() {window.autoconsentMessageCallback(")
+            .removeSuffix(", window.origin);})();")
         val moshi = Moshi.Builder().add(JSONObjectAdapter()).build()
         val jsonAdapter: JsonAdapter<InitResp> = moshi.adapter(InitResp::class.java)
         return jsonAdapter.fromJson(trimmedJson)

autoconsent/autoconsent-impl/src/test/java/com/duckduckgo/autoconsent/impl/handlers/OptOutAndAutoconsentDoneMessageHandlerPluginTest.kt

@@ -92,11 +92,7 @@ class OptOutAndAutoconsentDoneMessageHandlerPluginTest {
 
     @Test
     fun whenProcessOptOutWithSelfTestThenAutoconsentCallsEvaluateJavascript() {
-        val expected = """
-        javascript:(function() {
-            window.autoconsentMessageCallback({ "type": "selfTest" }, window.origin);
-        })();
-        """.trimIndent()
+        val expected = """javascript:(function() {window.autoconsentMessageCallback({ "type": "selfTest" }, window.origin);})();"""
 
         handler.process(getOptOut(), optOutMessage(result = true, selfTest = true), webView, mockCallback)
         handler.process(getAutoconsentType(), autoconsentDoneMessage(), webView, mockCallback)