Add common pagination config interface

* Make TasksPaginationConfig implement this
  interface

Author: EdricChan03

data/common/src/main/kotlin/com/edricchan/studybuddy/domain/common/paging/CommonPagingConfig.kt

@@ -0,0 +1,19 @@
+package com.edricchan.studybuddy.domain.common.paging
+
+import com.edricchan.studybuddy.domain.common.sorting.OrderSpec
+import kotlinx.coroutines.CoroutineScope
+
+/**
+ * Interface holding shared pagination options.
+ * @param OS Desired subclass [OrderSpec] generic for [orderByFields].
+ */
+interface CommonPagingConfig<OS : OrderSpec<*>> {
+    /** Desired [CoroutineScope] to cache the paging data in (see [androidx.paging.cachedIn] for more info). */
+    val cachedCoroutineScope: CoroutineScope
+
+    /** Number of items to be shown per page. */
+    val pageSize: Int
+
+    /** The set of [OS] configurations to order the resulting data by, */
+    val orderByFields: Set<OS>
+}

features/tasks/domain/src/main/kotlin/com/edricchan/studybuddy/features/tasks/domain/repo/TasksPaginationConfig.kt

@@ -1,5 +1,6 @@
 package com.edricchan.studybuddy.features.tasks.domain.repo
 
+import com.edricchan.studybuddy.domain.common.paging.CommonPagingConfig
 import com.edricchan.studybuddy.domain.common.sorting.OrderSpec
 import com.edricchan.studybuddy.domain.common.sorting.SortDirection
 import com.edricchan.studybuddy.features.tasks.domain.model.TaskItem
@@ -16,12 +17,12 @@ import kotlinx.coroutines.CoroutineScope
  * applied sequentially in-order.
  */
 data class TasksPaginationConfig(
-    val cachedCoroutineScope: CoroutineScope,
+    override val cachedCoroutineScope: CoroutineScope,
     val includeArchived: Boolean = false,
     val excludeCompleted: Boolean = false,
-    val pageSize: Int = 30,
-    val orderByFields: Set<TaskOrderSpec> = setOf(TaskOrderSpec())
-) {
+    override val pageSize: Int = 30,
+    override val orderByFields: Set<TaskOrderSpec> = setOf(TaskOrderSpec())
+) : CommonPagingConfig<TasksPaginationConfig.TaskOrderSpec> {
     data class TaskOrderSpec(
         override val field: TaskItem.Field = TaskItem.Field.CreatedAt,
         override val direction: SortDirection = SortDirection.Descending