feat: add address element for shipping and billing address

[aritro2002]

Type of Change

• Bugfix
• New feature
• Enhancement
• Refactoring
• Dependency updates
• Documentation
• CI/CD

Description

I have added address elements for shipping and billing addresses.
Two new elements have been created: ShippingAddressElement and BillingAddressElement.
These elements include a method called getAddress, which is used to fetch the entered details.

By default, all fields are required, but optional fields can also be specified.

Option Supported:
Full name: full_name
Address Line 1: line1
Address Line 2: line2
City: city
State: state
Country: country
Postal Code: postal_code
Phone Number: phone
Email: email

How did you test it?

Clone the repo and then set script src to http://localhost:9050/HyperLoader.js in index.html and the widget name as shippingAddressElement or billingAddressElement in script.js. To make any field optional we need to feed list in the options

const unifiedCheckoutOptions = {
    optional: ["phone", "email", "city", "full_name"],
  };
  const unifiedCheckout = widgets.create(
    "shippingAddressElement",
    unifiedCheckoutOptions
  );

Checklist

• I ran npm run re:build
• I reviewed submitted code
• I added unit tests for my changes where possible

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