Fixed the HTTP credentials issue

[pnpdev10]

Summary

Fixed the HTTP credentials issue in the terraform provider.

Root Cause

The problem was a type mismatch where the API returns secure as a boolean but the SDK expected a string.

Solution Applied

• Created a custom BoolString type that can unmarshal both boolean and string JSON values
• Updated SDK structs to use BoolString for the secure field
• Modified provider code to convert BoolString to string when processing data