fix: return bytes when decoding calldata bytes

[burak33bb]

Summary

• return bytes for decoded TYPE_BYTES calldata values
• add regression coverage for the decoded type and to_str() handling

Tests

• python -m pytest tests\unit\abi\test_calldata.py
• python -m pytest tests\unit --disable-warnings -v -m "not testnet"
• python -m pytest tests\unit
• python -m black --check genlayer_py\abi\calldata\decoder.py tests\unit\abi\test_calldata.py

Fixes #108

[coderabbitai]

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