Add Signer for CWT/COSE encode_and_sign function.

[dajiaji]

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[codecov]

Codecov Report

Merging #114 (7687f2a) into main (d39c1ac) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #114      +/-   ##
==========================================
+ Coverage   99.58%   99.59%   +0.01%     
==========================================
  Files          23       24       +1     
  Lines        1918     1980      +62     
  Branches      503      507       +4     
==========================================
+ Hits         1910     1972      +62     
  Misses          6        6              
  Partials        2        2              

Impacted Files	Coverage Δ
cwt/__init__.py	100.00% <100.00%> (ø)
cwt/const.py	100.00% <100.00%> (ø)
cwt/cose.py	100.00% <100.00%> (ø)
cwt/cwt.py	100.00% <100.00%> (ø)
cwt/signer.py	100.00% <100.00%> (ø)

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