merge {tcp,udp}/message to message

[jkralik]

No description provided.

[codecov-commenter]

Codecov Report

Merging #357 (a46d636) into v3 (e59fa91) will increase coverage by 0.47%.
The diff coverage is 67.61%.

@@            Coverage Diff             @@
##               v3     #357      +/-   ##
==========================================
+ Coverage   70.05%   70.52%   +0.47%     
==========================================
  Files          68       67       -1     
  Lines        5761     5568     -193     
==========================================
- Hits         4036     3927     -109     
+ Misses       1317     1242      -75     
+ Partials      408      399       -9     

Impacted Files	Coverage Δ
dtls/client.go	76.31% <ø> (ø)
dtls/options.go	46.95% <ø> (ø)
dtls/server.go	85.71% <0.00%> (+1.71%)	⬆️
message/type.go	80.00% <ø> (ø)
net/blockwise/blockwise.go	68.49% <ø> (ø)
tcp/client.go	8.10% <0.00%> (+3.63%)	⬆️
tcp/options.go	39.82% <ø> (ø)
tcp/responsewriter.go	70.37% <ø> (ø)
udp/client.go	86.66% <ø> (+3.15%)	⬆️
udp/client/clientobserve.go	67.24% <ø> (ø)
... and 25 more

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