Payment processing with adaptive pricing in classic checkout

[Mayisha]

Towards STRIPE-919

Changes proposed in this Pull Request:

Testing instructions

• Checkout to this branch
• Run the following commands

npm install
npm run up
npm start

• Add the following filter to allow adaptive pricing and checkout session in your store-
  add_filter('wc_stripe_is_checkout_sessions_available', '__return_true');

• Connect to a US Stripe account.

• Enable OCS in the Stripe settings page.

• Enable adaptive pricing under the OCS settings.

• Enable card and a couple more payment methods.

• Reconfigure the webhooks.

• As a logged in shopper, add a product to your cart and go to the checkout page. (shopper must be logged in)

• Verify that, the currency selector is displayed and the available currencies are USD and your local currency.

• Select your local currency and pay with card.

• As an admin, verify that the order is successful and the transaction details are present.

• 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)