Handle unsupported Waveforms with warning messages

[GDYendell]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.73%. Comparing base (3fe7b0c) to head (9cef711).

Files with missing lines	Patch %	Lines
src/fastcs/transports/epics/ca/ioc.py	60.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #316      +/-   ##
==========================================
- Coverage   90.79%   90.73%   -0.07%     
==========================================
  Files          70       70              
  Lines        2542     2546       +4     
==========================================
+ Hits         2308     2310       +2     
- Misses        234      236       +2     

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