fix(visitor): add stmt counter for export const

[kwonoj]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 45.24%. Comparing base (0933eb7) to head (fe6d1f2).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
...verage-instrument/src/visitors/coverage_visitor.rs	0.00%	7 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@ ## main #278 +/- ## ========================================== - Coverage 45.32% 45.24% -0.09%  ========================================== Files 30 30 Lines 3958 3965 +7 ========================================== Hits 1794 1794 - Misses 2164 2171 +7 

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