Feature migrate to poetry

[IgorChvyrov-sm]

Changes:

1. Migrated dependency management from requirements.txt to poetry (pyproject.toml)
2. Introduced Ruff linter with custom configuration
3. Migrated test runner from unittest to pytest (without test rewriting)

Reason:

1. Adopting Poetry for more reliable dependency management and virtualenv handling
2. Adding Ruff for linting with sensible defaults
3. Pytest provides more powerful testing features and cleaner syntax (test rewriting planned for future)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

see 86 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[am-orkes]

Can we add coverage config in pyproject.toml so as to not have yet another rc file?