feat: Allow passing custom preferences to chrome, enabling dev mode on chrome://extensions and allowing content script sourcemaps automatically

[aklinker1]

This fixes the dev mode issue in #236 and closes #137!

See the JS docs for example config:

wxt/src/types/external.ts

Lines 677 to 703 in 731dae7

	/**
	* An map of chrome preferences from https://chromium.googlesource.com/chromium/src/+/main/chrome/common/pref_names.h
	*
	* @example
	* // change your downloads directory
	* {
	* download: {
	* default_directory: "/my/custom/dir",
	* },
	* }
	*
	* @default
	* // Enable dev mode and allow content script sourcemaps
	* {
	* devtools: {
	* synced_preferences_sync_disabled: {
	* skipContentScripts: false,
	* },
	* }
	* extensions: {
	* ui: {
	* developer_mode: true,
	* },
	* }
	* }
	*/
	chromiumPref?: string;

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[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (98d2792) 79.87% compared to head (f5de267) 80.14%.

Files	Patch %	Lines
src/core/runners/web-ext.ts	75.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #384      +/-   ##
==========================================
+ Coverage   79.87%   80.14%   +0.27%     
==========================================
  Files         104      104              
  Lines        7556     7599      +43     
  Branches      677      680       +3     
==========================================
+ Hits         6035     6090      +55     
+ Misses       1505     1493      -12     
  Partials       16       16              

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[pftom]

@aklinker1 why chromiumPref is just string types with object assign values?