Rationale for this change

Followup to #35495 in which we added the MATLAB class Float32Array.

This pull request adds support for round tripping signed integer between arrow.array.<Array> classes and associated MATLAB types (e.g. int8, int16, int32, int64).

Example of round-tripping int8 data:

>> int8MatlabArray = int8([1, 2, 3]')

int8MatlabArray =

  3x1 int8 column vector

   1
   2
   3

>> int8ArrowArray = arrow.array.Int8Array(int8MatlabArray) 

int8ArrowArray = 

[
  1,
  2,
  3
]

>> int8MatlabArrayRoundTripped = toMATLAB(int8ArrowArray)

int8MatlabArrayRoundTripped =

  3x1 int8 column vector

   1
   2
   3

>> all(int8MatlabArray == int8MatlabArrayRoundTripped)

ans =

  logical

   1

What changes are included in this PR?

Added four new signed integer type arrow.array.<Array> concrete subclasses.

1. arrow.array.Int8Array
2. arrow.array.Int16Array
3. arrow.array.Int32Array
4. arrow.array.Int64Array

Are these changes tested?

Yes, we added the following four test classes:

1. tInt8Array.m
2. tInt16Array.m
3. tInt32Array.m
4. tInt64Array.m

Are there any user-facing changes?

Yes. This change introduces 4 new publicly documented classes:

1. arrow.array.Int8Array
2. arrow.array.Int16Array
3. arrow.array.Int32Array
4. arrow.array.Int64Array

Future Directions

1. Add support for null values (i.e. validity bitmap) for the signed integer array types.

Notes

!. Thank you to @sgilmore10 for her help with this pull request!

• Closes: [MATLAB] Add signed integer array MATLAB classes (i.e. Int8Array, Int16Array, Int32Array, Int64Array)  #35558