Change Android's MainActivity launchMode to singleTop (#4255)

* Add build config plugin to set .MainActivity launchMode

* Change android:launchMode to standard

* Revert "Change android:launchMode to standard"

This reverts commit fddbc4e1b5.

* adjust

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Co-authored-by: Hailey <me@haileyok.com>

app.config.js

@@ -204,6 +204,7 @@ module.exports = function (config) {
         ],
         './plugins/withAndroidManifestPlugin.js',
         './plugins/withAndroidManifestFCMIconPlugin.js',
+        './plugins/withAndroidManifestLaunchModePlugin.js',
         './plugins/withAndroidStylesWindowBackgroundPlugin.js',
         './plugins/withAndroidStylesAccentColorPlugin.js',
         './plugins/withAndroidSplashScreenStatusBarTranslucentPlugin.js',