feat: Add KDoc documentation to TaskRepositoryImpl

Added comprehensive KDoc documentation to the `TaskRepositoryImpl` class and its methods. This clarifies the purpose
 and behavior of each element, improving code readability and maintainability.

The documentation explains the role of the repository as a bridge between the domain and data layers, highlights the use of data mapping for object conversion, and describes the functionality of each repository method in detail.

core/local/repository/src/main/java/city/zouitel/repository/repositoryImpl/TaskRepositoryImpl.kt

@@ -8,25 +8,82 @@ import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.map
 import city.zouitel.domain.model.Task as OutTask
 
+/**
+ * Implementation of the [TaskRepository] interface.
+ *
+ * This class acts as a bridge between the domain layer ([TaskRepository]) and the data layer ([TaskDataSource]).
+ * It handles the conversion of data between domain objects ([Task], [OutTask]) and data source objects.
+ *
+ * @property dataSource The data source used to interact with the persistent storage of tasks.
+ * @property mapper The mapper used to convert between domain objects and data source objects.
+ */
 class TaskRepositoryImpl(
     private val dataSource: TaskDataSource,
     private val mapper: TaskMapper
 ): TaskRepository {
+
+    /**
+     * A [Flow] that emits a list of [Task] instances representing all tasks in the data source.
+     *
+     * This observable flow is derived from the underlying data source's [observeAll] flow.
+     * Each emission from the data source is transformed from a data model representation to
+     * a domain model representation using the provided [mapper].
+     *
+     * @see dataSource.observeAll The underlying flow emitting data model task lists.
+     * @see mapper The mapper used to transform data model tasks to domain model tasks.
+     * @return A [Flow] emitting a list of domain model [Task] objects.
+     */
     override val observeAll: Flow<List<Task>>
         get() = dataSource.observeAll.map { mapper.toDomain(it) }
 
+    /**
+     * Observes a stream of tasks associated with a specific user ID.
+     *
+     * This function retrieves a flow of task lists from the underlying data source,
+     * filtered by the provided user ID (`uid`). It then transforms each list of
+     * data source tasks into a list of domain tasks using the provided [mapper].
+     *
+     * @param uid The unique identifier of the user whose tasks are to be observed.
+     * @return A [Flow] emitting lists of [Task] objects associated with the given `uid`.
+     *         Emissions occur whenever the underlying data source updates the task list for this user.
+     */
     override fun observeByUid(uid: String): Flow<List<Task>> {
         return dataSource.observeByUid(uid).map { mapper.toDomain(it) }
     }
 
+    /**
+     * Inserts an [OutTask] into the data source.
+     *
+     * This method converts the domain layer [OutTask] object to a data layer
+     * representation using the [mapper] and then delegates the insertion
+     * operation to the underlying [dataSource].
+     *
+     * @param task The [OutTask] to be inserted.
+     */
     override suspend fun insert(task: OutTask) {
         dataSource.insert(mapper.fromDomain(task))
     }
 
+    /**
+     * Updates an entity in the data source by its ID.
+     *
+     * This function delegates the update operation to the underlying [dataSource].
+     *
+     * @param id The ID of the entity to update.
+     * @throws Exception if any error occurs during the update operation within the data source.
+     */
     override suspend fun updateById(id: Long) {
         dataSource.updateById(id)
     }
 
+    /**
+     * Deletes an entity from the data source by its unique identifier.
+     *
+     * This function delegates the deletion operation to the underlying [dataSource].
+     *
+     * @param id The unique identifier of the entity to be deleted.
+     * @throws Exception if any error occurs during the deletion process within the data source. The specific exception depends on the implementation of `dataSource.deleteById()`.
+     */
     override suspend fun deleteById(id: Long) {
         dataSource.deleteById(id)
     }