Add a very basic runtime check setup

[tmadlener]

BEGINRELEASENOTES

• Add a very basic test setup that uses CaloClouds3 to verify that things run
• "Fix" some reference counting issue by leaking a resource (with a proper fix deferred to the future)

ENDRELEASENOTES

The ref-counting issue was introduced with #10 (but since we didn't have any tests it wasn't notice then).

[tmadlener]

I cannot reproduce the test failures that CI sees "locally" for some reason.

[tmadlener]

Using a debug build this test seems to uncover a true issue that has laid dormant up until now. Specifically, this assert fires:

DDML/src/TorchInference.cc

Line 62 in 2d52147

assert(inputs.size() == tensDims.size());

That in turn is becaus CaloCloudsTwoAngleModel indeed defines 4 dimensions in the tensor but only fills three inputs:

DDML/include/DDML/CaloCloudsTwoAngleModel.h

Line 62 in 2d52147

TensorDimVecs m_tensDims = {{1, 1}, {1, 1}, {1, 1}, {1, 3}};

DDML/src/CaloCloudsTwoAngleModel.cc

Lines 46 to 49 in 2d52147

	// For now, assume batch size one, and just assign values
	inputs[0][0] = energy / CLHEP::GeV; // E_vec[0]/100.;
	inputs[1][0] = theta; // 89.*(M_PI/180.) ; //Theta_vec[0]/(90.*(M_PI/180.));
	inputs[2][0] = phi;

Not sure which of these need to be fixed.