[gnutls-devel] GnuTLS | ext: use gnutls_buffer_st to parse extension data instead of DECR_LEN (!2132)

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Daiki Ueno created a merge request: https://gitlab.com/gnutls/gnutls/-/merge_requests/2132

Project:Branches: dueno/gnutls:wip/dueno/ext-buffer to gnutls/gnutls:master
Author: Daiki Ueno

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

* ext: use gnutls_buffer_st to parse extension data

* alert: map GNUTLS_E_PARSING_ERROR to "decode_error" alert

As _gnutls_buffer_pop_* functions return GNUTLS_E_PARSING_ERROR upon
error, map the error to the same alert generated from
GNUTLS_E_UNEXPECTED_EXTENSIONS_LENGTH, so _gnutls_buffer_pop_* can be
used in the extension handling code.

Partially fixes: #1928

## Checklist
 * [x] Commits have `Signed-off-by:` with name/author being identical to the commit author
 * [ ] Code modified for feature
 * [ ] Test suite updated with functionality tests
 * [ ] Test suite updated with negative tests
 * [ ] Documentation updated / NEWS entry present (for non-trivial changes)

## 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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