[gnutls-devel] GnuTLS | tls13/key_update: Expose a manual KeyUpdate function (!2020)

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Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/2020

Project:Branches: dueno/gnutls:wip/alistair/key-update to gnutls/gnutls:master
Author:   Daiki Ueno




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

This is a clone of !1965 for CI purposes.

* tls13/key_update: Expose a manual KeyUpdate function

As part of supporting KeyUpdate in ktls-utils and NVMe-OF we need to
trigger an update of the local keys after the kernel has received a
KeyUpdate message.

This patch creates a new gnutls_handshake_update_receiving_key() function
that allows updating the local keys without sending any KeyUpdate
requests.

## 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
 * [ ] Test suite updated with negative tests
 * [x] Documentation updated / NEWS entry present (for non-trivial changes)

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

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