chore: import upstream snapshot with attribution

Sources/ContainerCommands/TableOutput.swift

@@ -0,0 +1,60 @@
+//===----------------------------------------------------------------------===//
+// Copyright © 2026 Apple Inc. and the container project authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//===----------------------------------------------------------------------===//
+
+import Foundation
+
+public struct TableOutput: Sendable {
+    private let rows: [[String]]
+    private let spacing: Int
+
+    public init(
+        rows: [[String]],
+        spacing: Int = 2
+    ) {
+        self.rows = rows
+        self.spacing = spacing
+    }
+
+    public func format() -> String {
+        var output = ""
+        let maxLengths = self.maxLength()
+
+        for rowIndex in 0..<self.rows.count {
+            let row = self.rows[rowIndex]
+            for columnIndex in 0..<row.count - 1 {
+                let currentLength = (maxLengths[columnIndex] ?? 0) + self.spacing
+                let padded = row[columnIndex].padding(toLength: currentLength, withPad: " ", startingAt: 0)
+                output += padded
+            }
+            // Skip padding for the last column.
+            output += row.last ?? ""
+            output += (rowIndex == self.rows.count - 1) ? "" : "\n"
+        }
+        return output
+    }
+
+    /// Returns a mapping of column index and the maximum length of all elements belonging under that column.
+    private func maxLength() -> [Int: Int] {
+        var output: [Int: Int] = [:]
+        for row in self.rows {
+            for (i, column) in row.enumerated() {
+                let currentMax = output[i] ?? 0
+                output[i] = (column.count > currentMax) ? column.count : currentMax
+            }
+        }
+        return output
+    }
+}