Create template for pytest sample data fixtures

[genedan]

Consider the repeated executions of setting/unsetting the backend to numpy, and loading the triangle, and yielding:

chainladder-python/conftest.py

Lines 24 to 39 in cffab2c

	@pytest.fixture
	def raa(request):
	if request.param == "sparse_only_run":
	cl.options.set_option("ARRAY_BACKEND", "sparse")
	else:
	cl.options.set_option("ARRAY_BACKEND", "numpy")
	return cl.load_sample("raa")
	@pytest.fixture
	def qtr(request):
	if request.param == "sparse_only_run":
	cl.options.set_option("ARRAY_BACKEND", "sparse")
	else:
	cl.options.set_option("ARRAY_BACKEND", "numpy")
	return cl.load_sample("quarterly")

This is repeated per sample data set. A template can be created that each data set can use so we can alter the template and propagate to the fixtures rather than update each one.