Added provisional FN-DSA implementation (2025-02-01, with ARM Cortex-… #377
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FN-DSA (to-be-standardized Falcon) with M4F optimizations. This is a "provisional" FN-DSA, since the FN-DSA standard is not published yet. This PR relies on the following PR to be first imported in mupq: mupq/mupq#162
Additional M4F optimizations are imported from https://github.com/pornin/c-fn-dsa
This works on my STM32F4 Discovery board. I do not have any other M4 board to test on.