feat: Support for HTML5 features for Alert Inputs

[cerkiner]

Feature Request

Ionic version:
[x] 5.x

Describe the Feature Request
It is necessary to add special attributes such as maxLength, inputmode, pattern, id etc. on inputs while using AlertController.

Describe Preferred Solution

Have new options for inputs to set custom attributes while creating alerts;

alert.addInput({
      name: 'pin',
      placeholder: 'Pin Code',
      type: 'password',
      maxLength: 4,
      inputmode: 'numeric',
      ...
});

Describe Alternatives

alert.present().then(v => {
   let input = (document.querySelector('ion-alert input') as any);
   if (input) {
      input.setAttribute('maxlength','4');
      input.setAttribute('inputmode','numeric');
      ...
   }
});

However, this is just a hacky workaround and it gets complicated really quickly with multiple inputs. I think Ionic team should include a feature to add custom attributes and other native HTML5 features for inputs.

[liamdebeasi]

Thanks for the issue. I am going to close this as a duplicate of #21202.

[cerkiner]

Oh okay. Sorry for the duplicate. I was working on this issue/improvement for some time. I checked when I started but I didn't re-check when I created the issue.

[ionitron-bot]

Thanks for the issue! This issue is being locked to prevent comments that are not relevant to the original issue. If this is still an issue with the latest version of Ionic, please create a new issue and ensure the template is fully filled out.