Move AppDaysUsedRepository to browser-api so it can be accessed from …

…autofill (#4474)

Task/Issue URL: https://app.asana.com/0/0/1207179707350731/f 

### Description
Moves a class from app module to `browser-api` so it can be used in autofill survey.

### Steps to test this PR
- [ ] QA-optional

app/src/main/java/com/duckduckgo/app/usage/app/AppDaysUsedRepository.kt → app/src/main/java/com/duckduckgo/app/usage/app/AppDaysUsedDatabaseRepository.kt

@@ -27,14 +27,6 @@ import kotlinx.coroutines.withContext
 
 private val formatter = SimpleDateFormat("yyyy-MM-dd", Locale.US)
 
-interface AppDaysUsedRepository {
-    suspend fun getNumberOfDaysAppUsed(): Long
-    suspend fun recordAppUsedToday()
-    suspend fun getNumberOfDaysAppUsedSinceDate(date: Date): Long
-    suspend fun getLastActiveDay(): String
-    suspend fun getPreviousActiveDay(): String?
-}
-
 class AppDaysUsedDatabaseRepository(private val appDaysUsedDao: AppDaysUsedDao) : AppDaysUsedRepository {
 
     private val singleThreadedDispatcher = Executors.newSingleThreadExecutor().asCoroutineDispatcher()

browser-api/src/main/java/com/duckduckgo/app/usage/app/AppDaysUsedRepository.kt

@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2024 DuckDuckGo
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.duckduckgo.app.usage.app
+
+import java.util.*
+
+/**
+ * Repository for storing and retrieving the number of days the app has been used
+ */
+interface AppDaysUsedRepository {
+
+    /**
+     * Get the number of days the app has been used
+     */
+    suspend fun getNumberOfDaysAppUsed(): Long
+
+    /**
+     * Record that the app has been used today
+     */
+    suspend fun recordAppUsedToday()
+
+    /**
+     * Get the number of days the app has been used since a given date
+     */
+    suspend fun getNumberOfDaysAppUsedSinceDate(date: Date): Long
+
+    /**
+     * Get the last day the app was used
+     */
+    suspend fun getLastActiveDay(): String
+
+    /**
+     * Get the previous active day
+     */
+    suspend fun getPreviousActiveDay(): String?
+}