Add type information to InitStageException::what()

[Demonmasterlqx]

When catching std::exception directly, the default error messages often lack specificity. By including the exception type within the what() string, we can provide better context in ROS_ERROR_STREAM and reduce confusion during debugging.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 52.86%. Comparing base (369cc97) to head (de703b9).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #738   +/-   ##
=======================================
  Coverage   52.86%   52.86%           
=======================================
  Files         138      138           
  Lines       10630    10630           
  Branches     1128     1128           
=======================================
  Hits         5618     5618           
  Misses       5004     5004           
  Partials        8        8           

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