[AB#3420 + AB#2581 + AB#2944] Update Stripe CC Processor

This PR requires both

(v2 update) https://github.com/SonarSoftwareInc/sonar/pull/2405
(v1 update) cancelled to be merged/deployed before this can be merged.

This PR adds the ability to use the Stripe\PaymentIntents API from the customer portal. This API handles all sensitive card details in their JavaScript integration and tokenizes the card, instead of using a standard form where we submit all card details to sonar. Customers may be prompted for additional authentication through their bank when submitting these forms, if deemed necessary by Stripe.

To use this, you must enable stripe in /settings/, and enter your publishable and private API keys.

pk_test_TYooMQauvdEDq54NiTphI7jx
sk_test_4eC39HqLyjWDarjtT1zdp7dc

It looks like this: stripe1 stripe2 strip4 stripe3

The following changes have been made:

dependencies
- new stripe/stripe-php
- update sonarsoftware/customer_portal_framework -> sonarsoftwareinc/customer_portal_framework
/settings configuration
- add stripe_enabled boolean
- add stripe_public_api_key string
- add stripe_private_api_key string
views
- stripe specific add card form if stripe_enabled is true
- stripe specific create payment form if stripe_enabled is true
misc
- create new function convertExpirationDateToYearAndMonth
- add legal disclaimer from stripe to auto payment checkbox text
related

SonarSoftwareInc / customer_portal

[AB#3420 + AB#2581 + AB#2944] Update Stripe CC Processor #90