Add new test matrix files

[randycoulman]

testmatrix_input_semantic_2.csv and testmatrix_variationId.csv tests are missing.
https://github.com/configcat/python-sdk/blob/master/configcatclienttests/testmatrix_input_semantic_2.csv
https://github.com/configcat/python-sdk/blob/master/configcatclienttests/testmatrix_variationId.csv

Originally posted by @laliconfigcat in #2 (comment)