Introduce a NIST KAT test generator

Parse the text files with test vectors and generate C headers that can
later be used by a test framework.
NIST KAT test vectors are used to provide ample coverage.
For now parsing of AES-CBC, AES-GCM, SHA-128 and SHA-256 is supported.

Signed-off-by: Eric Gouriou <ego@rivosinc.com>
Signed-off-by: Kornel Dulęba <mindal@semihalf.com>
Signed-off-by: Eric Gouriou <ego@rivosinc.com>