Allow Schemas/Blocks to specify description(kind) and deprecated

[hfern]

These fields are really only useful if you want to generate documentation from your schemas.

[Copilot]

Pull Request Overview

This PR adds support for description and deprecation metadata to Schema and Block classes in the Terraform plugin framework. It enables resource types, data sources, and providers to specify documentation descriptions with formatting options (Markdown or Plain text) and deprecation status.

• Added description, description_kind, and deprecated parameters to Schema and Block constructors
• Updated protobuf serialization to include these new fields with proper default handling
• Added comprehensive test coverage for the new functionality

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
tf/schema.py	Added description and deprecation fields to Schema and Block classes with protobuf serialization
tf/tests/test_schema.py	Added test cases for description formatting and deprecation functionality
CHANGELOG.md	Documented the new feature addition

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