* add various hooks and improve hooks folder structure
- Also restructures hooks directory to make things a bit more organized
- Add useStoreOrder placeholder (followed up in future pull)
- Add useBillingData hook.
* implement usePaymentMethodInterface hook in payment method components
* remove obsolete hooks and implement new checkout context hooks
- add useCheckoutSubmit which exposes checkout submit button interface
- add useCheckoutRedirectUrl which exposes checkout redirect url interface
* add alias for `@woocommerce/base-utils` to jest config
* use consistent variable names for payment method id
- restructures `@woocommerce/base-context` imports so it pulls from `index.js` in the `base/context` folder. That way tree-shaking will be used if possible. This also helps with organizing the folder structure a bit better for the new contexts.
- Fixes all the various imports through the code due to the above change.
- Adds `CheckoutContextProvider`, `useCheckoutContext` and related files.
- Adds `PaymentMethodDataProvider`, `usePaymentMethodDataContext` and related files.
- Adds `ShippingMethodDataProvider`, `useShippingMethodDataContext` and related files.
- Adds typedefs used for the various context interfaces.
Albert Juhé Lluveras
Darren Ethier