[TLS 1.3] Fuzz Target for Handshake Message Parsing

[lz101010]

Follow up for #2977 because I don't have push permissions on that branch.

[codecov-commenter]

Codecov Report

Merging #3013 (2ca420c) into master (db42866) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 2ca420c differs from pull request most recent head 36ec163. Consider uploading reports for the commit 36ec163 to get more accurate results

@@           Coverage Diff           @@
##           master    #3013   +/-   ##
=======================================
  Coverage   92.60%   92.60%           
=======================================
  Files         596      597    +1     
  Lines       69791    69806   +15     
  Branches     6617     6616    -1     
=======================================
+ Hits        64627    64645   +18     
+ Misses       5131     5128    -3     
  Partials       33       33           

Impacted Files	Coverage Δ
src/fuzzer/tls_13_handshake_layer.cpp	100.00% <100.00%> (ø)
src/fuzzer/ressol.cpp	85.71% <0.00%> (-7.15%)	⬇️
src/lib/pk_pad/emsa_raw/emsa_raw.cpp	71.42% <0.00%> (-2.86%)	⬇️
src/lib/misc/cryptobox/cryptobox.cpp	94.52% <0.00%> (-1.37%)	⬇️
src/lib/pubkey/mce/mceliece_key.cpp	84.29% <0.00%> (+1.04%)	⬆️
src/lib/asn1/der_enc.cpp	86.33% <0.00%> (+2.48%)	⬆️

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[lz101010]

Rebased to master. Fingers crossed for ci / Linux (Basic) (shared, clang) 🤞

[lz101010]

@reneme / @randombit feel free to merge, I also opened a PR for OSS-Fuzz: google/oss-fuzz#8320