Billing Policy Timeouts and other Billing Policy fixes

[mattdot]

This pull request includes several updates to the documentation and codebase for the Power Platform project. The changes primarily focus on improving documentation accuracy, adding timeout configurations, and enhancing the API client's functionality.

Documentation Updates:

• Updated nested schema references for the expand property in data_records.md to correct the hierarchy. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14]
• Added timeouts attribute to the billing policy documentation in billing_policy.md. [1] [2]

Code Enhancements:

• Added terraform-plugin-framework-timeouts dependency in go.mod.
• Introduced SleepWithContext method in api_client.go to handle context-aware sleep operations. [1] [2]
• Modified DoWaitForFinalStatus method in api_licensing.go to use the new SleepWithContext method and removed hardcoded timeout logic. [1] [2]

Resource Configuration:

• Integrated timeout configurations into the BillingPolicyResourceModel in resource_billing_policy.go. [1] [2] [3] [4]

These changes aim to enhance the documentation's accuracy and provide better resource management and error handling in the codebase.

Fixes #376