Basic support for submodule re-export

[ice1000]

As title

[codecov]

Codecov Report

❌ Patch coverage is 87.65432% with 10 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.63%. Comparing base (b329d66) to head (d35a3d2).
⚠️ Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
...src/main/java/org/aya/compiler/CompiledModule.java	85.29%	2 Missing and 8 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1446      +/-   ##
============================================
- Coverage     82.64%   82.63%   -0.01%     
- Complexity     4538     4550      +12     
============================================
  Files           394      394              
  Lines         13480    13513      +33     
  Branches       1653     1669      +16     
============================================
+ Hits          11141    11167      +26     
- Misses         1476     1477       +1     
- Partials        863      869       +6     

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