Automatically open a PR to bump the calver (#4167)

* Update our tools package to Swift 6.1

Also improves the package layout with subdirectories 📁

* Update GenerateSDKMocks to be an Async command.

* Add a tool to bump the project CalVer every month.

* Add a workflow to automatically bump the calendar version.

Note: This only does year & month, the patch is handled by the release script.

Tools/Sources/Commands/Locheck.swift

@@ -0,0 +1,45 @@
+import ArgumentParser
+import CommandLineTools
+import Foundation
+
+struct Locheck: ParsableCommand {
+    enum LocheckError: LocalizedError {
+        case missingMint
+        case outputError
+
+        var errorDescription: String? {
+            switch self {
+            case .missingMint:
+                return "💥 Unable to find mint. Fix by running:\nbrew install mint\n"
+            case .outputError:
+                return "💥 Failed to read the output from locheck."
+            }
+        }
+    }
+
+    static let configuration = CommandConfiguration(abstract: "A tool that verifies bad strings contained in localization files")
+
+    private var stringsDirectoryURL: URL {
+        .projectDirectory.appendingPathComponent("ElementX/Resources/Localizations")
+    }
+
+    func run() throws {
+        try checkMint()
+        try checkStrings()
+    }
+
+    func checkStrings() throws {
+        guard let output = try Zsh.run(command: "mint run locheck discoverlproj --ignore-missing --ignore lproj_file_missing_from_translation --treat-warnings-as-errors \(stringsDirectoryURL.path)") else {
+            throw LocheckError.missingMint
+        }
+        print(output)
+    }
+
+    private func checkMint() throws {
+        let result = try Zsh.run(command: "which mint")
+
+        if result?.contains("not found") == true {
+            throw LocheckError.missingMint
+        }
+    }
+}