Consents API support

[bandraszyk]

Consents namespace:

• List Consents: GET /consents - Docs
• List Consents (Client): GET /consents - Docs

Customers namespace:

• Update Customer's Consents: PUT /customers/{id}/consents - Docs
• Update Customer's Consents (Client): PUT /customers/{id}/consents - [Docs](https://docs.voucherify.io/reference#update-customers-consents-client