Add constructors for concatinating multiple arrays of TornadoNativeType instances

[mikepapadim]

Description

This pull request introduces a new constructor to TornadoNativeTypes, enabling the creation of a single instance by concatenating the contents of multiple array instances.

Backend/s tested

Mark the backends affected by this PR.

• [x] OpenCL
• [x] PTX
• [] SPIRV

OS tested

Mark the OS where this PR is tested.

• [x] Linux
• [ ] OSx
• [ ] Windows

Did you check on FPGAs?

If it is applicable, check your changes on FPGAs.

• [ ] Yes
• [x] No

How to test the new patch?

The functioality is already tests with the:

tornado-test -V --fast uk.ac.manchester.tornado.unittests.api.TestConcat

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[jjfumero]

Great. i am merging this PR.