fix: Enforce type checks on whitelisted methods

[surajshetty3416]

Enforce type checks on whitelisted methods

ref: frappe/frappe#36744

[codecov]

Codecov Report

❌ Patch coverage is 66.66667% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.64%. Comparing base (ed40db2) to head (bec85bf).
⚠️ Report is 10 commits behind head on develop.

Files with missing lines	Patch %	Lines
...ilder/builder/doctype/builder_page/builder_page.py	54.54%	5 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #495      +/-   ##
===========================================
+ Coverage    60.61%   60.64%   +0.03%     
===========================================
  Files           28       28              
  Lines         2722     2719       -3     
===========================================
- Hits          1650     1649       -1     
+ Misses        1072     1070       -2     

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