feat: Add submit command

[aklinker1]

This closes #57!

Adds the wxt submit and wxt submit init commands. Not using the word "publish" since npm publish is a built-in command. Naming it submit will hopefully guide people to calling their package.json scripts "submit" as well.

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[aklinker1]

Right now, I have it setup as an alias for publish-extension, and you have to pass the zips you want to upload.

I'm considering including building, zipping, and discovering all the zips in a single command. Like for example, the Firefox sources zip should never need to be passed for Firefox, WXT should know that it exists and is required.

[aklinker1]

Nope, for now, it'll just be an alias.

[codecov]

Codecov Report

Attention: 22 lines in your changes are missing coverage. Please review.

Comparison is base (6557dfe) 80.47% compared to head (965616f) 80.38%.

Files	Patch %	Lines
src/cli/cli-utils.ts	76.34%	22 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #370      +/-   ##
==========================================
- Coverage   80.47%   80.38%   -0.10%     
==========================================
  Files         104      107       +3     
  Lines        7645     7727      +82     
  Branches      689      694       +5     
==========================================
+ Hits         6152     6211      +59     
- Misses       1477     1500      +23     
  Partials       16       16              

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