feat(android-template): allow HTTP for debug builds

[tlancina]

This means livereload from localhost will work with no additional
configuration.

[jcesarmobile]

Thanks but I think we shouldn't enable it by default for debug builds, this will lead to different behaviour in debug and release configs and people not knowing why their connections fail only in release as already happen in Cordova and causes a lot of frustration.

It would be better if we had a new property in the server object of capacitor.config.json that the CLI could read and write this code into the capacitor-cordova-android-plugins module based on it (since it's autogenerated and overwritten by the CLI). Then document that property and also make Ionic CLI write it when using live reload command.

[tlancina]

Added it only for localhost, as this is what the starters currently do: https://github.com/ionic-team/starters/blob/master/integrations/cordova/resources/android/xml/network_security_config.xml.

Since a nice out of the box --livereload experience is what I'm going for, there is some work that needs to be done in the CLI to forward the ports as well as some documentation (if you're using --external you'll need to update network_security_config.xml). I feel like this is a good balance between default development experience and not shooting yourself in the foot by having to explicitly opt in to override the network config.

[jcesarmobile]

I've sent a PR with what I proposed, WDYT? #2395

this way, Ionic CLI should have to add this to the capacitor.config.json when doing ionic capacitor run android -l --external

"server": {
    "cleartext": true,
    "url": "http://local.ip.here:8100"
  }