PR #1604: Add privacy manifest

Imported from GitHub PR https://github.com/abseil/abseil-cpp/pull/1604

Looks like abseil is not using any of the APIs listed in https://developer.apple.com/documentation/bundleresources/privacy_manifest_files/describing_use_of_required_reason_api?language=objc, so adding an empty manifest file.

fixes #1602
Merge 79da4bd7b54949d5e01c04623842ea1d0d4fbe59 into f7d2b13e

Merging this change closes #1604

COPYBARA_INTEGRATE_REVIEW=https://github.com/abseil/abseil-cpp/pull/1604 from HannahShiSFB:privacy-manifests 79da4bd7b54949d5e01c04623842ea1d0d4fbe59
PiperOrigin-RevId: 600525731
Change-Id: I3fbc6dcc6e47032665a9fa72c000ae245a25dd52

PrivacyInfo.xcprivacy

+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>NSPrivacyTracking</key>
+  <false/>
+  <key>NSPrivacyCollectedDataTypes</key>
+  <array/>
+  <key>NSPrivacyTrackingDomains</key>
+  <array/>
+  <key>NSPrivacyAccessedAPITypes</key>
+  <array/>
+</dict>
+</plist>

absl/abseil.podspec.gen.py

@@ -30,6 +30,9 @@ Pod::Spec.new do |s|
     :git => 'https://github.com/abseil/abseil-cpp.git',
     :git => 'https://github.com/abseil/abseil-cpp.git',
     :tag => '${tag}',
     :tag => '${tag}',
   }
   }
+  s.resource_bundles = {
+    s.module_name => 'PrivacyInfo.xcprivacy',
+  }
   s.module_name = 'absl'
   s.module_name = 'absl'
   s.header_mappings_dir = 'absl'
   s.header_mappings_dir = 'absl'
   s.header_dir = 'absl'
   s.header_dir = 'absl'