Type annotations for boto3 BillingandCostManagementPricingCalculator

Provides type annotations for the `boto3` AWS Billing and Cost Management Pricing Calculator service. It enhances static type checking for `boto3` clients, resources, and their methods, offering improved autocomplete and error detection in IDEs and with tools like `mypy` and `pyright`. This package is part of the `mypy-boto3-builder` ecosystem, which typically releases updates in sync with `boto3` versions.