fix(contexts): Coerce large nested number values in context to strings

[jangjodi]

Coerce large nested numbers into strings so that they aren't rounded
See #66877 for more context of the original problem

Fixes #66692

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.36%. Comparing base (008ca57) to head (add800e).
Report is 2 commits behind head on master.

❗ Current head add800e differs from pull request most recent head bec019c. Consider uploading reports for the commit bec019c to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           master   #67488       +/-   ##
===========================================
+ Coverage   53.53%   79.36%   +25.82%     
===========================================
  Files        5403     6370      +967     
  Lines      227066   282241    +55175     
  Branches    39083    48570     +9487     
===========================================
+ Hits       121556   223989   +102433     
+ Misses     105158    57812    -47346     
- Partials      352      440       +88     

Files	Coverage Δ
src/sentry/interfaces/contexts.py	98.54% <100.00%> (+38.07%)	⬆️

... and 2715 files with indirect coverage changes

[leeandher]

Thanks for this fix!