arrow

GH-35623: [C++][Python] FixedShapeTensorType.ToString() should print the type's parameters (#36496)

### Rationale for this change

The string representation of two different `FixedShapeTensorType` objects is currently the same: `extension<arrow.fixed_shape_tensor>`.

### What changes are included in this PR?

Override general type `ToString()` method for `FixedShapeTensorType`. The string representation of a tensor in this PR is proposed as follows:

``` 
extension<arrow.fixed_shape_tensor[value_type=*, shape=[*]]
```
### Are these changes tested?

Yes, in Python and in C++.

### Are there any user-facing changes?

No.
* Closes: #35623

Lead-authored-by: AlenkaF <frim.alenka@gmail.com>
Co-authored-by: Alenka Frim <AlenkaF@users.noreply.github.com>
Co-authored-by: Benjamin Kietzman <bengilgit@gmail.com>
Signed-off-by: AlenkaF <frim.alenka@gmail.com>