arrow

GH-38418: [MATLAB]  Add method for extracting one row of an `arrow.tabular.Table` as a string (#38463)



### Rationale for this change

We would like to modify the display of the `arrow.tabular.Table` and `arrow.tabular.RecordBatch` classes to be more "MATLAB-like". In order to do this, we need to add a method to their respective C++ Proxy classes that  returns a single row of the Table/RecordBatch as a MATLAB `string` array.

### What changes are included in this PR?

Added  new function template:
```cpp 
template <typename TabularLike>
arrow::matlab::tabular::print_row(const std::shared_ptr<TabularLike>& tabularObject, const int64_t row_index) 
```
This function template returns a string representation of the specified row in `tabbularObject`. 

Added a new proxy method called `getRowString` to both the `Table` and `RecordBatch` C++ proxy classes. These methods invoke `print_row` to return a string representation of one row in the `Table`/`RecordBatch`.  Neither MATLAB class `arrow.tabular.Table` nor `arrow.tabular.RecordBatch` expose these methods directly because they will only be used internally for display. 

Below is an example Output of `getRowString()`:

```matlab
>> matlabTable = table([1; 2; 3], ["ABC"; "DE"; "FGH"], datetime(2023, 10, 25) + days(0:2)');
>> arrowTable = arrow.table(matlabTable);
>> rowOneAsString = arrowTable.Proxy.getRowString(struct(Index=int64(1)))

rowOneAsString = 

    "1 | "ABC" | 2023-10-25 00:00:00.000000"
```

### Are these changes tested?

Yes, added a new test class called `tTabularInternal.m`. Because `getRowString()` is not a method on the MATLAB classes `arrow.tabular.Table` and `arrow.tabular.RecordBatch`, this test class calls `getRowString()` on their `Proxy` properties, which are public but hidden.

### Are there any user-facing changes?

No.

* Closes: #38418

Lead-authored-by: Sarah Gilmore <sgilmore@mathworks.com>
Co-authored-by: sgilmore10 <74676073+sgilmore10@users.noreply.github.com>
Co-authored-by: Kevin Gurney <kevin.p.gurney@gmail.com>
Signed-off-by: Kevin Gurney <kgurney@mathworks.com>