Add encode() to COSE.

[dajiaji]

No description provided.

[codecov]

Codecov Report

Merging #294 (adf2418) into main (1875d84) will decrease coverage by 0.32%.
The diff coverage is 82.35%.

@@            Coverage Diff             @@
##             main     #294      +/-   ##
==========================================
- Coverage   97.54%   97.22%   -0.33%     
==========================================
  Files          27       27              
  Lines        2367     2417      +50     
==========================================
+ Hits         2309     2350      +41     
- Misses         58       67       +9     

Impacted Files	Coverage Δ
cwt/cose.py	96.24% <80.85%> (-2.23%)	⬇️
cwt/recipient_interface.py	98.03% <100.00%> (+0.08%)	⬆️

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