Fix argument length error for WriteSwiftDebugSettings (#3173)

Fix argument length errors by switching WriteSwiftDebugSettings to use a
param file when needed.

Previously when generating a very large project with 7000+ targets:
```
ERROR: /private/var/tmp/_bazel_jszumski/399f2da8a1f92cab020446a488e7bec6/rules_xcodeproj.noindex/build_output_base/external/rules_xcodeproj_generated/generator/tools/rules/xcodeproj/bazel-project/BUILD:12:10: Generating bazel-project.xcodeproj Debug-swift_debug_settings.py failed: (Exit -1): universal_swift_debug_settings failed: error executing WriteSwiftDebugSettings command (from target @@rules_xcodeproj_generated//generator/tools/rules/xcodeproj/bazel-project:bazel-project) 
  (cd /private/var/tmp/_bazel_jszumski/399f2da8a1f92cab020446a488e7bec6/rules_xcodeproj.noindex/build_output_base/execroot/register && \
  exec env - \
  bazel-out/darwin_x86_64-opt-exec-macos-x86_64-min13.0-applebin_macos-ST-5b758c1c0c80/bin/external/rules_xcodeproj/tools/generators/swift_debug_settings/universal_swift_debug_settings 1 {...lots of pairs here...}
# Configuration: 794c86670c8dbf3648f6dfd018247dc9402b8c0a923a1790920ea9bf34028e6a
# Execution platform: @@internal_platforms_do_not_use//host:host
Action failed to execute: java.io.IOException: Cannot run program "/var/tmp/_bazel_jszumski/install/fd0e803cd377e5d6c999b9f309de8848/process-wrapper" (in directory "/private/var/tmp/_bazel_jszumski/399f2da8a1f92cab020446a488e7bec6/rules_xcodeproj.noindex/build_output_base/execroot/register"): error=7, Argument list too long
```

Signed-off-by: John Szumski <[email protected]>

Author: jszumski

tools/generators/swift_debug_settings/src/SwiftDebugSettings.swift

@@ -1,4 +1,5 @@
 import Darwin
+import Foundation
 import ToolCommon
 
 @main
@@ -12,16 +13,32 @@ struct SwiftDebugSettings {
 
         do {
             // First argument is executable name
-            var rawArguments = CommandLine.arguments.dropFirst()
+            let rawArguments = CommandLine.arguments.dropFirst()
+            
+            // Check for a params file
+            var arguments: ArraySlice<String>
+            if let arg = rawArguments.first, rawArguments.count == 1,
+               arg.starts(with: "@")
+            {
+                arguments = try await parseParamsFile(String(arg.dropFirst()))
+            } else {
+                arguments = ArraySlice(rawArguments)
+            }
 
-            if try rawArguments.consumeArg("colorize", as: Bool.self) {
+            if try arguments.consumeArg("colorize", as: Bool.self) {
                 logger.enableColors()
             }
 
-            try await Generator().generate(rawArguments: rawArguments)
+            try await Generator().generate(rawArguments: arguments)
         } catch {
             logger.logError(error.localizedDescription)
             Darwin.exit(1)
         }
     }
+    
+    private static func parseParamsFile(
+        _ path: String
+    ) async throws -> ArraySlice<String> {
+        return try await ArraySlice(URL(fileURLWithPath: path).allLines.collect())
+    }
 }

xcodeproj/internal/pbxproj_partials.bzl

@@ -1049,6 +1049,8 @@ def _write_swift_debug_settings(
     )
 
     args = actions.args()
+    args.use_param_file("@%s")
+    args.set_param_file_format(format = "multiline")
 
     # colorize
     args.add(TRUE_ARG if colorize else FALSE_ARG)