[Fix] Authentication for customer schedules

[cpv123]

Overview

• First commit fixes an issue with authentication when trying to get a list of schedules for a customer
• Later commits add missing TS types for customer and schedules.

What was the authentication issue?

• Authentication error returned when trying to get schedules for a customer using omise.customers.schedules(customerID)
• This happened because in apiResources.js, the resourceActions function was taking an options argument (which includes private key), but further down in the schedules method, a new variable called options was be declared as var options =. This variable was hoisted and therefore leaving options as undefined
• Fixed by remove duplicate options variable, and instead passing _makeOptions() as an argument directly which is consistent with the rest of the file

[y-nk]

@varshard no way to get this merged ?