feat: add usps mail delivered binary sensor

[firstof9]

Proposed change

Add "USPS Mail Delivered" binary sensor.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests
• Documentation update
• Adds a new shipper
• Update existing shipper

Additional information

• This PR fixes or closes issue: fixes Add Sensor for delivered USPS mail. #915

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.38%. Comparing base (8608d22) to head (42447eb).
Report is 6 commits behind head on dev.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #922      +/-   ##
==========================================
- Coverage   95.07%   94.38%   -0.69%     
==========================================
  Files           8        8              
  Lines        1482     1532      +50     
==========================================
+ Hits         1409     1446      +37     
- Misses         73       86      +13     

Files	Coverage Δ
custom_components/mail_and_packages/const.py	100.00% <ø> (ø)
custom_components/mail_and_packages/helpers.py	93.08% <ø> (-1.64%)	⬇️
...stom_components/mail_and_packages/binary_sensor.py	95.89% <50.00%> (-1.30%)	⬇️

... and 3 files with indirect coverage changes