Add bpo CLI to open redirect URLs

[hugovk]

Open a bpo in the browser

Issues from bugs.python.org have been migrated to GitHub issues and have new numbers.

This command will open the redirect page to take you to the new issue.

$ bpo 46208
https://bugs.python.org/issue?@action=redirect&bpo=46208

This redirects to python/cpython#90366

[codecov]

Codecov Report

Merging #11 (623c2ee) into main (6f81aa3) will decrease coverage by 0.91%.
The diff coverage is 86.36%.

@@            Coverage Diff             @@
##             main      #11      +/-   ##
==========================================
- Coverage   97.67%   96.75%   -0.92%     
==========================================
  Files           4        4              
  Lines         172      185      +13     
==========================================
+ Hits          168      179      +11     
- Misses          4        6       +2     

Flag	Coverage Δ
GHA_Ubuntu	96.75% <86.36%> (-0.92%)	⬇️
GHA_Windows	96.75% <86.36%> (-0.92%)	⬇️
GHA_macOS	95.67% <86.36%> (-2.00%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/pepotron/__init__.py	94.36% <78.57%> (-2.41%)	⬇️
tests/test_pepotron.py	100.00% <100.00%> (ø)

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