feat: Adds createMany for rooms, in prep for parsing / uploading a csv file of room loads.

Sources/DatabaseClient/Internal/Sequence+asyncMap.swift

@@ -0,0 +1,41 @@
+import Foundation
+
+extension Sequence {
+
+  // Taken from: https://forums.swift.org/t/are-there-any-kind-of-asyncmap-method-for-a-normal-sequence/77354/7
+  func asyncMap<Result: Sendable>(
+    _ transform: @escaping @Sendable (Element) async throws -> Result
+  ) async rethrows -> [Result] where Element: Sendable {
+    try await withThrowingTaskGroup(of: (Int, Result).self) { group in
+
+      var i = 0
+      var iterator = self.makeIterator()
+      var results = [Result?]()
+      results.reserveCapacity(underestimatedCount)
+
+      func submitTask() throws {
+        try Task.checkCancellation()
+        if let element = iterator.next() {
+          results.append(nil)
+          group.addTask { [i] in try await (i, transform(element)) }
+          i += 1
+        }
+
+      }
+
+      // Add initial tasks
+      for _ in 0..<ProcessInfo.processInfo.processorCount {
+        try submitTask()
+      }
+
+      // Submit more tasks as results complete
+      while let (index, result) = try await group.next() {
+        results[index] = result
+        try submitTask()
+      }
+
+      return results.compactMap { $0 }
+
+    }
+  }
+}