Add @esteffin to a few areas of the codebase

[TGWDB]

This mostly improves coverage where @esteffin should be listed.

• Each commit message has a non-empty body, explaining why the change was made.
• Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
• My commit message includes data points confirming performance improvements (if claimed).
• My PR is restricted to a single feature or bugfix.
• White-space or formatting changes outside the feature-related changed lines are in commits of their own.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.59% 🎉

Comparison is base (6f14542) 78.22% compared to head (13fa8b7) 78.82%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7859      +/-   ##
===========================================
+ Coverage    78.22%   78.82%   +0.59%     
===========================================
  Files         1699     1699              
  Lines       195105   195105              
===========================================
+ Hits        152621   153790    +1169     
+ Misses       42484    41315    -1169     

see 47 files with indirect coverage changes

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