feat: allow multiple aliases per fastcs PV in CA transport

[shihab-dls]

During beamline testing, we found that a single fastcs PV may need to be aliased to multiple PVs for GDA support. This PR allows aliases to be passed in as str, EnumMapping, list[str], or [list[EnumMapping].

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.53%. Comparing base (9133573) to head (e7ada60).

Additional details and impacted files

@@                 Coverage Diff                  @@
##           add_enum_mapping     #421      +/-   ##
====================================================
+ Coverage             91.49%   91.53%   +0.03%     
====================================================
  Files                    72       72              
  Lines                  3034     3047      +13     
====================================================
+ Hits                   2776     2789      +13     
  Misses                  258      258              

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