Add Enzyme performance warning

[gdalle]

DI README

• Add warning about Enzyme performance pitfalls, until we solve Multiple arguments / activities? #311 and Make Enzyme dispatches compatible with closures  #339. @wsmoses what do you think?

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.81%. Comparing base (00bc4f9) to head (500d888).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #344   +/-   ##
=======================================
  Coverage   96.81%   96.81%           
=======================================
  Files         101      101           
  Lines        4835     4835           
=======================================
  Hits         4681     4681           
  Misses        154      154           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.