[gnutls-devel] GnuTLS | gnutls_cipher_suite_get_name2: new function which works with TLS 1.3 (!1513)

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Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/1513

Project:Branches: dueno/gnutls:wip/dueno/iana-cs to gnutls/gnutls:master
Author:   Daiki Ueno




This adds a couple of functions to retrieve ciphersuite names in TLS 1.3. `gnutls_cipher_suite_get_name2` is similar to `gnutls_cipher_suite_get_name` but takes a PRF hash algorithm which can be checked with `gnutls_prf_hash_get`.

The returned name is GnuTLS specific: to convert it to IANA registered name, use `gnutls_cipher_suite_name_to_iana`. We can't consolidate those into a single function, as we still support legacy ciphersuites not registered in IANA.

Fixes: #1291

## Checklist
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [x] Code modified for feature
 * [x] Test suite updated with functionality tests
 * [x] Test suite updated with negative tests
 * [ ] 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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