Split UpdatesGridGlanceWidget into smaller bits (#8991)

- Renamed Composables
- Moved Constants to core module

(cherry picked from commit 2501fef9e4800e6a616b418d1cbec0ea2b9e282e)

# Conflicts:
#	app/src/main/java/eu/kanade/tachiyomi/ui/browse/migration/search/SourceSearchScreen.kt

presentation-widget/src/main/java/tachiyomi/presentation/widget/util/GlanceUtils.kt

@@ -0,0 +1,42 @@
+package tachiyomi.presentation.widget
+
+import androidx.annotation.StringRes
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.unit.DpSize
+import androidx.glance.GlanceModifier
+import androidx.glance.LocalContext
+import androidx.glance.appwidget.cornerRadius
+
+fun GlanceModifier.appWidgetBackgroundRadius(): GlanceModifier {
+    return this.cornerRadius(R.dimen.appwidget_background_radius)
+}
+
+fun GlanceModifier.appWidgetInnerRadius(): GlanceModifier {
+    return this.cornerRadius(R.dimen.appwidget_inner_radius)
+}
+
+@Composable
+fun stringResource(@StringRes id: Int): String {
+    return LocalContext.current.getString(id)
+}
+
+/**
+ * Calculates row-column count.
+ *
+ * Row
+ * Numerator: Container height - container vertical padding
+ * Denominator: Cover height + cover vertical padding
+ *
+ * Column
+ * Numerator: Container width - container horizontal padding
+ * Denominator: Cover width + cover horizontal padding
+ *
+ * @return pair of row and column count
+ */
+fun DpSize.calculateRowAndColumnCount(): Pair<Int, Int> {
+    // Hack: Size provided by Glance manager is not reliable so take at least 1 row and 1 column
+    // Set max to 10 children each direction because of Glance limitation
+    val rowCount = (height.value / 95).toInt().coerceIn(1, 10)
+    val columnCount = (width.value / 64).toInt().coerceIn(1, 10)
+    return Pair(rowCount, columnCount)
+}