feat: Module system

[aklinker1]

This closes #665.

See new docs to get started with modules: https://deploy-preview-672--creative-fairy-df92c4.netlify.app/guide/go-further/reusable-modules.html or if this is already merged, https://wxt.dev/guide/go-further/reusable-modules.html

Todo

• defineWxtModule
  • Resolve options from wxt.config.ts
  • Verify option types can be appended to InlineConfig interface so devs get type hints inside wxt.config.ts
• addPublicAssets
• addViteConfig
• addEntrypoint
• addWxtPlugin
• Custom imports
• Add docs

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[codecov]

Codecov Report

Attention: Patch coverage is 87.69231% with 48 lines in your changes missing coverage. Please review.

Project coverage is 87.35%. Comparing base (34ea230) to head (49b20e9).

Files	Patch %	Lines
packages/wxt/src/modules.ts	81.53%	24 Missing ⚠️
...ages/wxt/src/core/utils/building/resolve-config.ts	88.52%	7 Missing ⚠️
packages/wxt/src/sandbox/define-wxt-plugin.ts	0.00%	4 Missing and 1 partial ⚠️
.../src/core/builders/vite/plugins/wxtPluginLoader.ts	95.16%	3 Missing ⚠️
packages/wxt/src/virtual/background-entrypoint.ts	0.00%	2 Missing ⚠️
...irtual/content-script-isolated-world-entrypoint.ts	0.00%	2 Missing ⚠️
...rc/virtual/content-script-main-world-entrypoint.ts	0.00%	2 Missing ⚠️
...ages/wxt/src/virtual/unlisted-script-entrypoint.ts	0.00%	2 Missing ⚠️
packages/wxt/src/sandbox/index.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #672      +/-   ##
==========================================
+ Coverage   86.80%   87.35%   +0.55%     
==========================================
  Files         114      117       +3     
  Lines        9241     9620     +379     
  Branches      930      962      +32     
==========================================
+ Hits         8022     8404     +382     
+ Misses       1205     1201       -4     
- Partials       14       15       +1     

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[aklinker1]

@Timeraa This work is done! I'll provide some examples to help you get started with the devtools soon...

[Timeraa]

@Timeraa This work is done! I'll provide some examples to help you get started with the devtools soon...

Sounds good!