📝 Add docstrings to reduce-saga-storage-overhead

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Docstrings generation was requested by @vadikko2.

• Reduce saga storage overhead #61 (comment)

The following files were modified:

• examples/saga.py
• examples/saga_fallback.py
• examples/saga_recovery.py
• examples/saga_recovery_scheduler.py
• examples/saga_sqlalchemy_storage.py
• src/cqrs/saga/compensation.py
• src/cqrs/saga/execution.py
• src/cqrs/saga/saga.py
• src/cqrs/saga/storage/memory.py
• src/cqrs/saga/storage/protocol.py
• src/cqrs/saga/storage/sqlalchemy.py
• tests/benchmarks/dataclasses/test_benchmark_saga_memory.py
• tests/benchmarks/dataclasses/test_benchmark_saga_sqlalchemy.py
• tests/benchmarks/default/test_benchmark_saga_memory.py
• tests/benchmarks/default/test_benchmark_saga_sqlalchemy.py
• tests/unit/test_saga/test_saga_storage_run.py

These file types are not supported

• README.md
• pyproject.toml

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