Response is missing response headers and pagination

[dnl-blkv]

How to Reproduce

1. Make a valid listing request to bunq API via the Python SDK
2. Make a valid get/put/post/delete request to bunq API via the Python SDK

What Should Happen

1. The response contains response headers and pagination
2. The response contains response headers

What Happens

1. The response does not contain response header nor pagination
2. The response does not contain response header

Notes

1. The structural fix would be to introduce BunqResponse object which, besides the response model, includes the response headers and pagination

[OGKevin]

Related to #8

[OGKevin]

Closing as #10 has been merged.