Extract credit card validation logic into a separate module

[chrisfalaska]

Consider extracting credit card validation logic into a separate module.

The credit card validation logic can be extracted to reduce complexity while maintaining functionality. For example:

// CreditCardValidator.js
export class CreditCardValidator {
  validate(value) {
    const card = this.matchCard(value);
    return {
      maxLength: card.formatLength,
      minLength: card.formatMinLength,
      icon: card.cardIcon,
      isValid: this.validateCard(value, card)
    };
  }

  matchCard(value) {
    // Credit card matching logic moved here
  }
}

// BaseInput.js
import { CreditCardValidator } from './CreditCardValidator';

export default class BaseInput extends LitElement {
  constructor() {
    super();
    this.creditCardValidator = new CreditCardValidator();
  }

  processCreditCard() {
    const result = this.creditCardValidator.validate(this.value);
    this.maxLength = result.maxLength;
    this.minLength = result.minLength;
    this.inputIconName = result.icon;
  }
}

This separates concerns while keeping all functionality intact. The credit card validation is encapsulated in its own module with a clear interface.

Originally posted by @sourcery-ai[bot] in #16 (comment)

[chrisfalaska]

https://github.com/AlaskaAirlines/auro-input/blob/main/src/base-input.js#L856-L960