DESCRIPTORS: Add a metadata scheme

Part of #24.

Signed-off-by: Gama <misept.dieseneuf@gmail.com>
TESTS: Add a tests common source file

Signed-off-by: Gama <misept.dieseneuf@gmail.com>
TESTS: Add a sinus generator for testing purpose

Signed-off-by: Gama <misept.dieseneuf@gmail.com>
DESCRIPTORS: Add two tests for ASC regarding output bounds for pure sin

Signed-off-by: Gama <misept.dieseneuf@gmail.com>