fix: Add isSecureContext endowment

[FrederikBolding]

Adds isSecureContext for the browser environments, this will continue to be undefined in the Node.js environment.

Fixes #2890

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.48%. Comparing base (5052aaa) to head (2fa278d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2893   +/-   ##
=======================================
  Coverage   94.48%   94.48%           
=======================================
  Files         486      486           
  Lines       10399    10399           
  Branches     1594     1594           
=======================================
  Hits         9825     9825           
  Misses        574      574           

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[naugtur]

this is fine. I'm also wondering if passing true wouldn't be enough