Implement month separator for the Gallery.

Improve day separator rendering in the timeline.
Use Today, Yesterday, and the name of the day if less than 7 days and do not render the year for the current year.
Improve date format for the media viewer.
Rework how date and time are computed.
ActionListView: Time can take more space, so update the layout.

libraries/dateformatter/api/src/main/kotlin/io/element/android/libraries/dateformatter/api/DateFormatter.kt

@@ -0,0 +1,26 @@
+/*
+ * Copyright 2024 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only
+ * Please see LICENSE in the repository root for full details.
+ */
+
+package io.element.android.libraries.dateformatter.api
+
+interface DateFormatter {
+    fun format(
+        timestamp: Long?,
+        mode: DateFormatterMode = DateFormatterMode.Full,
+        useRelative: Boolean = false,
+    ): String
+}
+
+enum class DateFormatterMode {
+    Full,
+    Month,
+    Day,
+    // Time if same day, else date
+    TimeOrDate,
+    // Only time whatever the day
+    TimeOnly,
+}

libraries/dateformatter/api/src/main/kotlin/io/element/android/libraries/dateformatter/api/DaySeparatorFormatter.kt

@@ -1,12 +0,0 @@
-/*
- * Copyright 2023, 2024 New Vector Ltd.
- *
- * SPDX-License-Identifier: AGPL-3.0-only
- * Please see LICENSE in the repository root for full details.
- */
-
-package io.element.android.libraries.dateformatter.api
-
-interface DaySeparatorFormatter {
-    fun format(timestamp: Long): String
-}

libraries/dateformatter/api/src/main/kotlin/io/element/android/libraries/dateformatter/api/LastMessageTimestampFormatter.kt

@@ -1,12 +0,0 @@
-/*
- * Copyright 2023, 2024 New Vector Ltd.
- *
- * SPDX-License-Identifier: AGPL-3.0-only
- * Please see LICENSE in the repository root for full details.
- */
-
-package io.element.android.libraries.dateformatter.api
-
-fun interface LastMessageTimestampFormatter {
-    fun format(timestamp: Long?): String
-}