Show tooltips instead of Toasts when long-pressing attachment images (#4382)

- Use `TooltipCompat.setTooltipText()` instead of setting an
`OnLongClickListener` showing a Toast, to show the attachment
description. This method will display native tooltips on API 26+, and
set an `OnLongClickListener` on older versions to display a special
Toast anchored to the view. In both cases this provides a better user
experience.
- Simplify `Attachment.getFormattedDescription()` by using Kotlin's
`Duration`. Since it's an inline class, no extra memory will be
allocated on the heap. Also, ensure that the calculation of minutes and
hours use the rounded number of seconds instead of the non-rounded one.

app/src/main/java/com/keylesspalace/tusky/util/AttachmentHelper.kt

@@ -6,24 +6,22 @@ import android.content.Context
 import com.keylesspalace.tusky.R
 import com.keylesspalace.tusky.entity.Attachment
 import kotlin.math.roundToInt
+import kotlin.time.Duration.Companion.seconds
 
 fun Attachment.getFormattedDescription(context: Context): CharSequence {
-    var duration = ""
-    if (meta?.duration != null && meta.duration > 0) {
-        duration = formatDuration(meta.duration.toDouble()) + " "
-    }
-    return if (description.isNullOrEmpty()) {
-        duration + context.getString(R.string.description_post_media_no_description_placeholder)
+    val durationInSeconds = meta?.duration ?: 0f
+    val duration = if (durationInSeconds > 0f) {
+        durationInSeconds.roundToInt().seconds.toComponents { hours, minutes, seconds, _ ->
+            "%d:%02d:%02d ".format(hours, minutes, seconds)
+        }
     } else {
-        duration + description
+        ""
+    }
+    return duration + if (description.isNullOrEmpty()) {
+        context.getString(R.string.description_post_media_no_description_placeholder)
+    } else {
+        description
     }
-}
-
-private fun formatDuration(durationInSeconds: Double): String {
-    val seconds = durationInSeconds.roundToInt() % 60
-    val minutes = durationInSeconds.toInt() % 3600 / 60
-    val hours = durationInSeconds.toInt() / 3600
-    return "%d:%02d:%02d".format(hours, minutes, seconds)
 }
 
 fun List<Attachment>.aspectRatios(): List<Double> {