[React Native] Install @react-native-firebase (solve pod install issue)

## Podfile
  
## ...

target '{your project name}' do
  config = use_native_modules!

+  ## firebase
+  use_frameworks! :linkage => :static
+  $RNFirebaseAsStaticFramework = true

  ## Flags change depending on the env values.
  flags = get_default_flags()

  use_react_native!(
    :path => config[:reactNativePath],
    ## Hermes is now enabled by default. Disable by setting this flag to false.
    ## Upcoming versions of React Native may rely on get_default_flags(), but
    ## we make it explicit here to aid in the React Native upgrade process.
    :hermes_enabled => flags[:hermes_enabled],
    :fabric_enabled => flags[:fabric_enabled],
    ## Enables Flipper.
    #
    ## Note that if you have use_frameworks! enabled, Flipper will not work and
    ## you should disable the next line.
-    :flipper_configuration => flipper_config,
+    :flipper_configuration => FlipperConfiguration.disabled, ## firebase
    ## An absolute path to your application rosot.
    :app_path => "#{Pod::Config.instance.installation_root}/.."
  )

  target '{your project name}Tests' do
    inherit! :complete
    ## Pods for testing
  end

  post_install do |installer|
    react_native_post_install(
      installer,
      ## Set `mac_catalyst_enabled` to `true` in order to apply patches
      ## necessary for Mac Catalyst builds
      :mac_catalyst_enabled => false
    )
    __apply_Xcode_12_5_M1_post_install_workaround(installer)

+    ## for Firebase (all below)
+    installer.pods_project.targets.each do |target|
+      target.build_configurations.each do |config|
+        config.build_settings["GCC_WARN_INHIBIT_ALL_WARNINGS"] = "YES"
+      end
+    end

+    installer.pods_project.targets.each do |target|
+      target.build_configurations.each do |config|
+        config.build_settings["CC"] = "clang"
+        config.build_settings["LD"] = "clang"
+        config.build_settings["CXX"] = "clang++"
+        config.build_settings["LDPLUSPLUS"] = "clang++"
+      end
+    end

+    installer.aggregate_targets.each do |aggregate_target|
+      aggregate_target.user_project.native_targets.each do |target|
+        target.build_configurations.each do |config|
+          config.build_settings['ONLY_ACTIVE_ARCH'] = 'YES'
+          config.build_settings['EXCLUDED_ARCHS'] = 'i386'
+        end
+      end
+      aggregate_target.user_project.save
+    end

+    installer.pods_project.targets.each do |target|
+      if (target.name.eql?('FBReactNativeSpec'))
+        target.build_phases.each do |build_phase|
+          if (build_phase.respond_to?(:name) && build_phase.name.eql?('[CP-User] Generate Specs'))
+            target.build_phases.move(build_phase, 0)
+          end
+        end
+      end
+    end

+    installer.pods_project.targets.each do |target|
+      target.build_configurations.each do |config|
+        config.build_settings["ENABLE_BITCODE"] = "NO"
+      end
+    end
  end
end