feat: same interface for all brokers/result backends

[danfimov]

closes #8

[Copilot]

Pull Request Overview

This PR implements a unified interface for all PostgreSQL brokers and result backends by creating base classes that provide common functionality. The changes consolidate shared code patterns across different PostgreSQL driver implementations while maintaining compatibility with asyncpg, psqlpy, and aiopg drivers.

Key changes:

• Created base classes BasePostgresBroker and BasePostgresResultBackend to standardize interfaces
• Refactored existing broker and result backend implementations to inherit from base classes
• Updated project configuration and dependencies for better development workflow
• Added comprehensive integration tests and documentation setup

Reviewed Changes

Copilot reviewed 23 out of 28 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
src/taskiq_pg/_internal/broker.py	New base broker class with common PostgreSQL broker functionality
src/taskiq_pg/_internal/result_backend.py	New base result backend class with shared result storage logic
src/taskiq_pg/asyncpg/broker.py	Refactored to inherit from base broker class
src/taskiq_pg/asyncpg/result_backend.py	Refactored to inherit from base result backend class
src/taskiq_pg/psqlpy/broker.py	Refactored to inherit from base broker class
src/taskiq_pg/psqlpy/result_backend.py	Refactored to inherit from base result backend class
src/taskiq_pg/aiopg/result_backend.py	Refactored to inherit from base result backend class
tests/integration/test_result_backend.py	New integration tests for all result backend implementations
pyproject.toml	Updated project configuration, dependencies, and build system

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