feat!: New wxt/storage APIs

[aklinker1]

This closes #228. This will be the storage util provided in v1.0, unless people have really strong feelings about it not being good enough.

• Implement
• Test
• Try in demo extension
• Add docs

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[codecov]

Codecov Report

Attention: 11 lines in your changes are missing coverage. Please review.

Comparison is base (e1f1813) 70.40% compared to head (48adcb0) 72.54%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
src/storage.ts	98.07%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #300      +/-   ##
==========================================
+ Coverage   70.40%   72.54%   +2.14%     
==========================================
  Files         134      134              
  Lines        7511     7980     +469     
  Branches      583      669      +86     
==========================================
+ Hits         5288     5789     +501     
+ Misses       2171     2139      -32     
  Partials       52       52              

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