arrow

GH-37472: [MATLAB] Implement the `isequal()` method on `arrow.type.Type` (#37474)



### Rationale for this change

Currently, it's not possible to determine if two `arrow.type.Type` instances are equal because the `isequal()` method always returns `false` by default:

```matlab

>> t = arrow.int32()

t = 

  Int32Type with properties:

    ID: Int32

% Compare a with itself
>> tf = isequal(t, t)

tf =

  logical

   0

```

### What changes are included in this PR?

1. Implemented the `isequal` method on all concrete subclasses of `arrow.type.Type` 
2. Added a new method called `isEqual()` on the `arrow::matlab::type::proxy::Type` class.

**Example Usage**

```matlab
>> t1 = arrow.timestamp(TimeUnit="Second");
>> t2 = arrow.timestamp(TimeUnit="Microsecond");
>> t3 = arrow.timestamp(TimeUnit="Second");

% Compare t1 and t2
>> tf1 = isequal(t1, t2)

tf1 =

  logical

   0

% Compare t1 and t3
>> tf2 = isequal(t1, t3)

tf2 =

  logical

   1
```

### Are these changes tested?

Yes. Added test cases verifying `isequal` behaves as expected for all concrete subclasses of `arrow.type.Type`.

### Are there any user-facing changes?

Yes. Users can now use the `isequal` method to compare `arrow.type.Type` instances for equality.

### Future Directions

1. Implement the `isequal` method for `arrow.type.Field`
2. Implement the `isequal` method for `arrow.tabular.Schema` 

* Closes: #37472

Authored-by: Sarah Gilmore <sgilmore@mathworks.com>
Signed-off-by: Kevin Gurney <kgurney@mathworks.com>