[gnutls-devel] GnuTLS | ext/record_size_limit: distinguish sending and receiving limits (!985)

[Development of GNU's TLS library]

New Merge Request !985

https://gitlab.com/gnutls/gnutls/merge_requests/985

Branches: tmp-record-sizes to master
Author:    Daiki Ueno
Assignee:  


This fully implements the asymmetric record_size_limit negotiation.

The previous behavior was that both sending and receiving limits are negotiated to be the same value.  It was problematic when:
    
- client sends a record_size_limit with a large value in CH
- server sends a record_size_limit with a smaller value in EE
- client updates the limit for both sending and receiving, upon receiving EE
- server sends a Certificate message larger than the limit
    
With this patch, each peer maintains the sending / receiving limits separately so not to confuse with the contradicting settings.

## 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)
 * [ ] 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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