Spike: Integrate Bank Transfer Payment Method

[lovo-h]

Fixes #4103

Changes proposed in this Pull Request:

The changes in this PR demonstrate how we might be able to integrate the Bank Transfer payment method.

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• Covered with tests (or have a good reason not to test in description ☝️)
• Tested on mobile (or does not apply)

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Post merge

• Added testing instructions to the Release Testing Instructions wiki page (or does not apply)
• Added the needs docs label (or does not apply)
• Included this PR in the Release Thread scope (or does not apply)

[github-actions]

📈 PHP Unit Code Coverage Report

Package	Line Rate	Health
includes/abstracts/abstract-wc-stripe-payment-gateway.php	49%	❌
includes/admin/class-wc-stripe-settings-controller.php	20%	❌
includes/class-wc-stripe-feature-flags.php	95%	✔
includes/class-wc-stripe-intent-controller.php	25%	❌
includes/constants/class-wc-stripe-payment-methods.php	0%	❌
includes/payment-methods/class-wc-stripe-upe-payment-gateway.php	49%	❌
includes/payment-methods/class-wc-stripe-upe-payment-method-bank-transfer.php	92%	✔
woocommerce-gateway-stripe.php	27%	❌
Summary	44% (6999 / 15887)	❌