feat: add support to currency_options

[augustoccesar]

Summary

Currency_options field is represented by an optional HashMap<Currency, T>.

This affects the following resources:

• CheckoutSession: When defining the shipping rate fixed amount, there is the option of setting specific amounts per currency. See: https://stripe.com/docs/api/checkout/sessions/create#create_checkout_session-shipping_options-shipping_rate_data-fixed_amount-currency_options
• Coupon: Can have different amounts for different currencies. Which means that it can contain it, be created with it or be updated to have it. See: https://stripe.com/docs/api/coupons/object#coupon_object-currency_options
• Invoice: When defining shipping rate fixed amount, there is the option of setting specific amounts per currency. See: https://stripe.com/docs/api/invoices/create#create_invoice-shipping_cost-shipping_rate_data-fixed_amount-currency_options
• Price: A price can have different amounts available on different currencies. Which means that it can contain it, be created with it or be updated to have it. See: https://stripe.com/docs/api/invoices/create#create_invoice-shipping_cost-shipping_rate_data-fixed_amount-currency_options
• Product: When creating a product, it can be defined currency options of the nested prices (as defined above on Price). See: https://stripe.com/docs/api/products/create#create_product-default_price_data-currency_options
• PromotionCode: Promotion codes can have restrictions based on defined currencies. See: https://stripe.com/docs/api/promotion_codes/object#promotion_code_object-restrictions-currency_options
• ShippingRate: As seen on CheckoutSession and Invoice, a shipping rate can be defined per specific currency. See: https://stripe.com/docs/api/shipping_rates/object#shipping_rate_object-fixed_amount-currency_options

Closes #351

Checklist

• [x] ran cargo make fmt
• [x] using conventional commits to hightlight user-facing fixes and features

[arlyon]

Running ci, thanks!

[codecov[bot]]

Codecov Report

Merging #383 (34e800e) into master (b3732b1) will increase coverage by 0.00%. The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #383   +/-   ##
======================================
  Coverage    6.07%   6.08%           
======================================
  Files         142     142           
  Lines       21718   21718           
======================================
+ Hits         1319    1321    +2     
+ Misses      20399   20397    -2     

Impacted Files	Coverage Δ
src/params.rs	79.19% <ø> (ø)
src/resources/generated/checkout_session.rs	0.00% <ø> (ø)
src/resources/generated/coupon.rs	0.00% <ø> (ø)
src/resources/generated/invoice.rs	0.15% <ø> (ø)
src/resources/generated/price.rs	2.48% <ø> (+0.55%)	:arrow_up:
src/resources/generated/product.rs	0.00% <ø> (ø)
src/resources/generated/promotion_code.rs	0.00% <ø> (ø)
src/resources/generated/shipping_rate.rs	0.00% <ø> (ø)

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[augustoccesar]

@arlyon Is there anything else that I need to do here?

[arlyon]

Nope! thanks for the ping, I have been out for the last 2 weeks on holiday 🏄 and have been working through the backlog. Merging :)