feat: support treeshaking wasm modules

[brendandahl]

Use binaryen's wasm-metadce to perform treeshaking on Wasm modules.

resolves #57

This builds on #55 and could use some more testing, but I wanted to get a little feedback before I go any further.

[codecov]

Codecov Report

❌ Patch coverage is 90.52632% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 89.15%. Comparing base (67a94a9) to head (f0363e4).
⚠️ Report is 35 commits behind head on main.

Files with missing lines	Patch %	Lines
src/plugin/runtime/treeshake.ts	86.44%	8 Missing ⚠️
src/plugin/index.ts	97.05%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #60      +/-   ##
==========================================
- Coverage   90.80%   89.15%   -1.65%     
==========================================
  Files           6        9       +3     
  Lines         500      415      -85     
  Branches       53       82      +29     
==========================================
- Hits          454      370      -84     
  Misses         45       45              
+ Partials        1        0       -1     

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