added idempotencyKey prop to ApiError

[janpaepke]

For Details see https://github.com/mollie/mollie-api-node/pull/294#issuecomment-1326326017 (Idea 3).

Changes:

• ApiError constructor params are moved into an object
  1. With the addition of idempotencyKey the parameter list got unreadably long
  2. The order of the parameters does not matter
• passing idempotencyKey from config in static ApiError.createFromResponse.
• reverted header assignment (see https://github.com/mollie/mollie-api-node/pull/294#discussion_r1033311534)
• exposing ApiError as MollieApiError for type-safe checks.
• added tests