chore: Add envrc

[untitaker]

I've been carrying this one with me for a while in .git/info/exclude, feel free to accept or ignore.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.61%. Comparing base (385c668) to head (8b4c43c).

⚠️ Parser warning

The parser emitted a warning. Please review your JUnit XML file:

Warning while parsing testcase attributes: Limit of string is 1000 chars, for name, we got 2301 at 1:203142 in /__w/sentry-python/sentry-python/.junitxml

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4414   +/-   ##
=======================================
  Coverage   80.61%   80.61%           
=======================================
  Files         142      142           
  Lines       15973    15973           
  Branches     2727     2727           
=======================================
  Hits        12877    12877           
  Misses       2240     2240           
  Partials      856      856