Make CameraX blocklist remote configurable.

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

@@ -0,0 +1,23 @@
+package org.signal.core.util
+
+/**
+ * Treats the string as a serialized list of tokens and tells you if an item is present in the list.
+ * In addition to exact matches, this handles wildcards at the end of an item.
+ *
+ * e.g. a,b,c*,d
+ */
+fun String.asListContains(item: String): Boolean {
+  val items: List<String> = this
+    .split(",")
+    .map { it.trim() }
+    .filter { it.isNotEmpty() }
+    .toList()
+
+  val exactMatches = items.filter { it.last() != '*' }
+  val prefixMatches = items.filter { it.last() == '*' }
+
+  return exactMatches.contains(item) ||
+    prefixMatches
+      .map { it.substring(0, it.length - 1) }
+      .any { item.startsWith(it) }
+}