Attempt to fix SQLite crash in migration.

core-util/src/main/java/org/signal/core/util/StringExtensions.kt

@@ -21,3 +21,20 @@ fun String.asListContains(item: String): Boolean {
       .map { it.substring(0, it.length - 1) }
       .any { item.startsWith(it) }
 }
+
+/**
+ * Turns a multi-line string into a single-line string stripped of indentation, separated by spaces instead of newlines.
+ *
+ * e.g.
+ *
+ * a
+ *   b
+ * c
+ *
+ * turns into
+ *
+ * a b c
+ */
+fun String.toSingleLine(): String {
+  return this.trimIndent().split("\n").joinToString(separator = " ")
+}