bug: @ionic/core PickerOptions interface missing "showBackdrop" property

[dustindowns]

Bug Report

Ionic version:
5.2.3

Current behavior:
The PickerOptions interface is missing the showBackdrop property. When adding that property to an object that implements the PickerOptions interface, the following TS error occurs: "Object literal may only specify known properties, and 'showBackdrop' does not exist in type 'PickerOptions'."

Expected behavior:
Adding the showBackdrop property to the object that implements the PickerOptions interface should not cause a TS error, since it is a valid option.

Steps to reproduce:

1. Create an object that implements the PickerOptions interface.
2. Add the "columns" property, with an empty array value. (To satisfy the required property of the interface).
3. Add the showBackdrop property to the object, with a boolean value.

Related code:
StackBlitz

Other information:
My current workaround is implementing the following interface:

interface IonicPickerOptions extends PickerOptions {
  showBackdrop?: boolean;
}

Ionic info:

Ionic:

   Ionic CLI                     : 5.2.3 (/Users/dustin.downs/.nvm/versions/node/v10.16.0/lib/node_modules/ionic)
   Ionic Framework               : @ionic/angular 4.7.0
   @angular-devkit/build-angular : 0.801.2
   @angular-devkit/schematics    : 8.1.2
   @angular/cli                  : 8.1.2
   @ionic/angular-toolkit        : 1.5.1

Capacitor:

   Capacitor CLI   : 1.1.1
   @capacitor/core : 1.1.1

Utility:

   cordova-res : not installed
   native-run  : not installed

System:

   NodeJS : v10.16.0 (/Users/dustin.downs/.nvm/versions/node/v10.16.0/bin/node)
   npm    : 6.10.2
   OS     : macOS Mojave

[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.