Add Cards package implementation

[heyitsaamir]

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Generated by the Adaptive Cards team.

Closes #57

[Copilot]

Pull Request Overview

This PR implements a new Cards package for the Microsoft Teams Python SDK, replacing a minimal AdaptiveCard placeholder with a full implementation. The changes update import statements and constructor calls throughout the codebase to align with the new Cards package structure.

• Replaces the minimal AdaptiveCard class with a full Cards package implementation
• Updates all AdaptiveCard constructor calls to use model_validate() instead of direct instantiation
• Consolidates import statements and updates project configuration

Reviewed Changes

Copilot reviewed 10 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
packages/cards/src/microsoft/teams/cards/adaptive_card.py	Removes the minimal AdaptiveCard placeholder implementation
packages/app/src/microsoft/teams/app/app.py	Updates import to use new Cards package structure
packages/app/src/microsoft/teams/app/app_process.py	Updates import to use new Cards package structure
tests/message-extensions/src/cards.py	Updates AdaptiveCard instantiation to use model_validate()
tests/dialogs/src/main.py	Updates AdaptiveCard instantiation to use model_validate()
tests/graph/src/main.py	Consolidates imports from microsoft.teams.app
packages/graph/src/microsoft/teams/graph/auth_provider.py	Removes all export declaration
packages/graph/pyproject.toml	Updates build system from setuptools to hatchling
pyproject.toml	Updates pyright version and adds line length exception for cards package
pyrightconfig.json	Adds test paths and cards package configuration

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[lilyydu]

could we match TS/C# and place the generator code into core.py instead? I'm gonna be adding the missing classes/folders that will use this file

https://github.com/microsoft/teams.ts/tree/main/packages/cards/src