Add ScyllaDB license headers

[dkropachev]

Summary

• add the Apache License 2.0 text in LICENSE
• add the ScyllaDB Apache 2.0 header to every Python source, test, and example file
• enable Ruff CPY001 with the ScyllaDB copyright notice and require Ruff 0.16+
• preserve executable-script shebang placement

Testing

• make lint
• uv run ruff check --select CPY alternator/ tests/ examples/
• make test-unit (503 passed, 3 skipped; 82.86% coverage)
• verified all 71 tracked Python files carry the header

Fixes: DRIVER-712
Fixes: #62

Epic: DRIVER-49

[Copilot]

Pull request overview

Adds Apache 2.0 licensing across the project and enforces future copyright notices through Ruff.

Changes:

• Adds the Apache 2.0 license and headers to all 71 Python files.
• Preserves example-script shebang placement.
• Enables Ruff CPY001 and requires Ruff 0.16+.

Reviewed changes

Copilot reviewed 73 out of 73 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
LICENSE	Adds Apache 2.0 license text.
pyproject.toml	Configures Ruff copyright checks.
alternator/__init__.py	Adds license header.
alternator/_constants.py	Adds license header.
alternator/_http.py	Adds license header.
alternator/_version.py	Adds license header.
alternator/async_client.py	Adds license header.
alternator/client.py	Adds license header.
alternator/config.py	Adds license header.
alternator/exceptions.py	Adds license header.
alternator/vector.py	Adds license header.
alternator/core/__init__.py	Adds license header.
alternator/core/auth.py	Adds license header.
alternator/core/compression.py	Adds license header.
alternator/core/deterministic_rand.py	Adds license header.
alternator/core/handlers.py	Adds license header.
alternator/core/hashing.py	Adds license header.
alternator/core/headers.py	Adds license header.
alternator/core/key_affinity.py	Adds license header.
alternator/core/live_nodes.py	Adds license header.
alternator/core/query_plan.py	Adds license header.
alternator/core/request.py	Adds license header.
alternator/core/routing_scope.py	Adds license header.
alternator/core/tls.py	Adds license header.
examples/async_demo.py	Adds header after shebang.
examples/capability_configuration.py	Adds header after shebang.
examples/compare_aws_sdk.py	Adds header after shebang.
examples/sync_demo.py	Adds header after shebang.
tests/__init__.py	Adds license header.
tests/conftest.py	Adds license header.
tests/integration/__init__.py	Adds license header.
tests/integration/scylla_version.py	Adds license header.
tests/integration/test_async_client.py	Adds license header.
tests/integration/test_batch_transactions.py	Adds license header.
tests/integration/test_composite_keys.py	Adds license header.
tests/integration/test_connection_reuse.py	Adds license header.
tests/integration/test_header_optimization.py	Adds license header.
tests/integration/test_key_affinity_operations.py	Adds license header.
tests/integration/test_live_nodes.py	Adds license header.
tests/integration/test_node_health.py	Adds license header.
tests/integration/test_request_compression.py	Adds license header.
tests/integration/test_response_compression.py	Adds license header.
tests/integration/test_sdk_config.py	Adds license header.
tests/integration/test_sync_client.py	Adds license header.
tests/integration/test_tls.py	Adds license header.
tests/integration/test_vector.py	Adds license header.
tests/integration/test_wrong_dc_rack.py	Adds license header.
tests/integration/wire_capture.py	Adds license header.
tests/unit/__init__.py	Adds license header.
tests/unit/test_async_manager.py	Adds license header.
tests/unit/test_auth.py	Adds license header.
tests/unit/test_boto_config.py	Adds license header.
tests/unit/test_client_alias.py	Adds license header.
tests/unit/test_compression.py	Adds license header.
tests/unit/test_config.py	Adds license header.
tests/unit/test_deterministic_rand.py	Adds license header.
tests/unit/test_fake_alternator_server.py	Adds license header.
tests/unit/test_hashing.py	Adds license header.
tests/unit/test_hashing_properties.py	Adds license header.
tests/unit/test_headers.py	Adds license header.
tests/unit/test_helper.py	Adds license header.
tests/unit/test_http.py	Adds license header.
tests/unit/test_key_affinity.py	Adds license header.
tests/unit/test_live_nodes.py	Adds license header.
tests/unit/test_network_failures.py	Adds license header.
tests/unit/test_query_plan.py	Adds license header.
tests/unit/test_request.py	Adds license header.
tests/unit/test_request_lifecycle.py	Adds license header.
tests/unit/test_response_compression.py	Adds license header.
tests/unit/test_routing_scope.py	Adds license header.
tests/unit/test_scylla_version.py	Adds license header.
tests/unit/test_sync_manager.py	Adds license header.
tests/unit/test_tls.py	Adds license header.

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