Merge RecipientsBuilder into Recipients.

[dajiaji]

No description provided.

[codecov]

Codecov Report

Merging #103 (57ea966) into main (8808bb8) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #103      +/-   ##
==========================================
- Coverage   99.58%   99.58%   -0.01%     
==========================================
  Files          24       23       -1     
  Lines        1917     1910       -7     
  Branches      502      502              
==========================================
- Hits         1909     1902       -7     
  Misses          6        6              
  Partials        2        2              

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

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