Add optimized NTT and invNTT in C #4461

Job	Run time
Check API consistency (false, pqcp-arm64, aarch64)	38s
Linting (ubuntu-latest)	1m 28s
Examples (macos-latest)	9s
Check API consistency (false, ubuntu-latest, x86_64)	46s
Examples (ubuntu-latest)	4s
Examples (ubuntu-24.04-arm)	8s
lint-markdown-link	37s
Quickcheck (aarch64)	2m 26s
Quickcheck C90 (aarch64)	2m 0s
Quickcheck C90 (x86_64)	3m 7s
Quickcheck lib (macos-latest)	15s
Quickcheck windows-latest	42s
Quickcheck lib (ubuntu-latest)	19s
Quickcheck (x86_64)	2m 32s
Quickcheck lib (ubuntu-24.04-arm)	5s
Functional tests (${{ matrix.target.arch }}${{ (((matrix.target.mode != 'native') && ', cross') \|\| '') }})	0s
Compiler tests (${{ matrix.compiler.name }}, ${{ matrix.target.name }})	0s
Non-standard configurations	0s
Platform tests (${{ matrix.target.name }})	0s
CBMC (ML-KEM-512)	0s
CBMC (ML-KEM-768)	0s
Compatibility tests (${{ matrix.container.id }})	0s
Compatibility tests (${{ matrix.container.id }})	0s
CBMC (ML-KEM-1024)	0s
	15m 16s

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