fix: make yomo_wanted_target function optional in wasm

[wujunzhuo]

Description

This is a bug fix pr which allows wasm runtimes do NOT implement yomo_wanted_target function.

[vercel]

@wujunzhuo is attempting to deploy a commit to the YoMo Team on Vercel.

A member of the Team first needs to authorize it.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 7 lines in your changes missing coverage. Please review.

Project coverage is 46.74%. Comparing base (ba744f6) to head (9554ac5).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
cli/serverless/wasm/wazero.go	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #980      +/-   ##
==========================================
+ Coverage   46.48%   46.74%   +0.26%     
==========================================
  Files          97       97              
  Lines        6723     6721       -2     
==========================================
+ Hits         3125     3142      +17     
+ Misses       3401     3379      -22     
- Partials      197      200       +3     

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