VGS - Add support for valid card brands

[StoneMoney]

From: https://app.productive.io/2650-4site-interactive-studios-inc/tasks/15072056

This implements support in the VGS module to allow a client theme to specify supported card brands. By default, all brands are supported (with a value of null, rather than an exhaustive list). Because of this, I have made a special exception to the deepMerge, as deep merging with the defaultOptions having value of null or undefined would result in a failed merge, defaultOptions having all available card types would result in all available card types working regardless of client theme specification, and defaultOptions having a value of an empty array would require all client themes be updated to specify what card types are needed. This was my best approach to maximizing compatibility.

Test page: https://protect.worldwildlife.org/page/69817/donate/1?assets=deny-diner-jcb&debug=log

Testing steps:
Attempting any card only requires inputting the value into the credit card field, no other fields are needed to be filled to test validation.

• Attempt a test visa card 4242424242424242, no error should occur for the credit card field when hitting submit.
• Attempt a test Diner's Club card 3056930009020004, a "Credit Card number is invalid" error should occur
• Attempt a test union pay card 6200000000000005, no error should occur
• Attempt a test JCB card 3566002020360505, a "Credit Card number is invalid" error should occur

Further testing could include pulling the deny-diner-jcb branch, and this vgs-card-brands branch together locally and modifying the options in index.ts:91 such as

• Removing the options entirely and testing that all brands work
• Removing visa and testing that a visa card now has an invalid error
• Adding jcb and testing that jcb no longer has an invalid error

Just remember to update the url such that assets=local

The list of available brand codes is here: https://docs.verygoodsecurity.com/vault/developer-tools/vgs-collect/js/customization#card-brand-identification