[Python] pa.array([Decimal("nan")]) raises

### Describe the bug, including details regarding any error messages, version, and platform.

```
pa.array([Decimal("nan")])

Traceback (most recent call last):
File "", line 1, in
File "pyarrow/array.pxi", line 320, in pyarrow.lib.array
File "pyarrow/array.pxi", line 39, in pyarrow.lib._sequence_to_array
File "pyarrow/error.pxi", line 144, in pyarrow.lib.pyarrow_internal_check_status
File "pyarrow/error.pxi", line 100, in pyarrow.lib.check_status
pyarrow.lib.ArrowInvalid: Decimal precision out of range [1, 38]: -2147483648
```

Based on how pyarrow handles numpy nans I'd expect this to get converted to a pyarrow null.

pyarrow 11.0.0 on mac

### Component(s)

Python

Reproduce the failure with pyarrow 11.0.0 and Decimal("nan"), then compare it with NumPy NaN handling. Start from the conversion path named in pyarrow/array.pxi and the error reported through pyarrow/error.pxi; done means Decimal NaN becomes a PyArrow null and the behavior is covered by a regression test.

Written by the indexing model from the issue text.