[gnutls-devel] GnuTLS | Follow-up for ML-DSA support (!1916)

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Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1916

Project:Branches: dueno/gnutls:wip/dueno/mldsa-followup to gnutls/gnutls:master
Author:   Daiki Ueno




<!-- Add a description of the new feature/bug fix. Reference any relevant bugs. -->

* tests: add basic tests for ML-DSA usage with certtool

* nettle: ensure liboqs is loaded for signing operations with ML-DSA

* algorithms: expose ML-DSA algorithm entries regardless of liboqs

* algorithms: document ML-KEM/ML-DSA in public enums

* algorithms: rename GNUTLS_PK_MLKEM768 to GNUTLS_PK_ML_KEM_768

To be consistent with ML-DSA algorithms, this renames
GNUTLS_PK_MLKEM768 to GNUTLS_PK_ML_KEM_768, while the old name is
preserved through a compatibility macro.

* certtool: enable ML-DSA private key generation

* x509: assume PKCS#8 for ML-DSA private keys

Given the ML-DSA private keys are always represented in the PKCS#8
PrivateKeyInfo, stop using the specific "-----BEGIN ML-DSA PRIVATE
KEY-----" PEM header.

* fips: perform pair-wise consistency test for ML-DSA

Also mark the signature creation and verification operation as
non-approved, as the current version of liboqs doesn't implement
sufficient checks for input.

## Checklist
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [ ] Code modified for feature
 * [x] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [x] Documentation updated / NEWS entry present (for non-trivial changes)
 * [ ] CI timeout is 2h or higher (see Settings/CICD/General pipelines/Timeout)

## Reviewer's checklist:
 * [ ] Any issues marked for closing are addressed
 * [ ] There is a test suite reasonably covering new functionality or modifications
 * [ ] Function naming, parameters, return values, types, etc., are consistent and according to `CONTRIBUTION.md`
 * [ ] This feature/change has adequate documentation added
 * [ ] No obvious mistakes in the code

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