arrow

GH-36168: [C++][Python] Support halffloat for Arrow list to pandas (#35944)



### Rationale for this change
When we translate `float16` from `pyarrow` to `pandas`, no error occurs:
```
>>> df = pd.DataFrame({"a": [np.float16(1), np.float16(2), np.float16(3)]})
>>> table = pa.Table.from_pandas(df)
>>> df_new = table.to_pandas()
```
But, when we use list:
```
>>> df = pd.DataFrame({"a": [[np.float16(1)], [np.float16(2)], [np.float16(3)]]})
>>> table = pa.Table.from_pandas(df)
>>> df_new = table.to_pandas()
pyarrow.lib.ArrowNotImplementedError: Not implemented type for Arrow list to pandas: halffloat
```

### What changes are included in this PR?

### Are these changes tested?
Yes

### Are there any user-facing changes?
Yes

* Closes: #36168

Authored-by: izveigor <izveigor@gmail.com>
Signed-off-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>