feat: Make IMPORT and EXPORT path elements escapable

[ferenc-csaky]

Key Changes

• Call stripQuotes when we create a Name instance
• Updated DAG a planner test case and a usecase test to cover the added functionality
• Removed some dead code
• Some refactor to use string libs instead of replicating the same functionality in our repo

[codecov]

Codecov Report

❌ Patch coverage is 30.76923% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 15.94%. Comparing base (b72db80) to head (660bd7a).
⚠️ Report is 3 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...in/java/com/datasqrl/loaders/ModuleLoaderImpl.java	0.00%	6 Missing ⚠️
...m/datasqrl/planner/util/SqlTableNameExtractor.java	33.33%	1 Missing and 1 partial ⚠️
...in/java/com/datasqrl/planner/SqlScriptPlanner.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2185      +/-   ##
============================================
- Coverage     15.95%   15.94%   -0.02%     
+ Complexity     1016     1014       -2     
============================================
  Files           619      618       -1     
  Lines         17925    17899      -26     
  Branches       2193     2189       -4     
============================================
- Hits           2860     2854       -6     
+ Misses        14782    14764      -18     
+ Partials        283      281       -2     

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