Add softioc functions to ca context

[shihab-dls]

fixes #190

This PR adds softioc commands to the ca transport context, allowing us to run commands like dbl etc.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.22%. Comparing base (5231029) to head (df829b7).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #191      +/-   ##
==========================================
+ Coverage   92.20%   92.22%   +0.01%     
==========================================
  Files          40       40              
  Lines        2065     2070       +5     
==========================================
+ Hits         1904     1909       +5     
  Misses        161      161              

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