GPU: Add prototype for SMatrixGPU testing

[mconcas]

As anticipated at the last FST/GPU meeting, a student will advance in porting and testing the DCAFitterN class on GPU.
To this extent, I ported (3 years ago) an SVector and SMatrix implementation from ROOT to a usable GPU version.

I am now adding the skeleton of a unit test (CUDA/HIP) to ensure the required functions (the ones used in the fitter class) work.
For the moment, I added the inversion test of a simple 3x3 symmetric matrix as a test.

The student will then be responsible for extending this test by adding the required methods.

I expect the FullCI to fail since no GPU is available. It will probably require some massage in alidist as it is done for the GPU sort test.

[alibuild]

Error while checking build/O2/fullCI for f4175f1 at 2024-02-13 00:46:

## sw/BUILD/O2-latest/log
c++: error: unrecognized command-line option '--rtlib=compiler-rt'
c++: error: unrecognized command-line option '--rtlib=compiler-rt'


## sw/BUILD/o2checkcode-latest/log
--
========== List of errors found ==========
++ GRERR=0
++ grep -v clang-diagnostic-error error-log.txt
++ grep ' error:'
/sw/SOURCES/O2/12693-slc8_x86-64/0/GPU/Common/test/testSMatrixImp.hip:109:3: error: use '= default' to define a trivial destructor [modernize-use-equals-default]
++ [[ 0 == 0 ]]
++ exit 1
--

Full log here.

[davidrohr]

fine with me after coding violation is fixed

[mconcas]

fine with me after coding violation is fixed

ok, then it's ready