Returns the list of banks Cardda supports. This is global reference data:
it is not scoped to a company, returns the same list to every caller, and
requires no authentication — this endpoint accepts requests with no
Authorization bearer token and no company-id header.

Use each bank's id (a stable slug such as cl_banco_estado) as the bank_id
value when creating bank recipients, reading balances, or filtering by bank.

Results are paginated and support the standard _start/_end/_order/_field
window, and the response carries X-Total-Count / Content-Range headers.