feat(auth): useIsCurrentUserLoaded() composable

[Soviut]

Closes #1306

[posva]

Thanks!

[Soviut]

@posva I also added docs. Let me know if those are okay.

[codecov-commenter]

Codecov Report

Merging #1307 (0db548f) into main (9a961d4) will decrease coverage by 0.12%.
The diff coverage is 66.66%.

❗ Current head 0db548f differs from pull request most recent head 222ac37. Consider uploading reports for the commit 222ac37 to get more accurate results

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@@            Coverage Diff             @@
##             main    #1307      +/-   ##
==========================================
- Coverage   90.05%   89.94%   -0.12%     
==========================================
  Files          21       21              
  Lines        3218     3232      +14     
  Branches      317      317              
==========================================
+ Hits         2898     2907       +9     
- Misses        320      325       +5     

Impacted Files	Coverage Δ
src/storage/index.ts	83.65% <0.00%> (-0.54%)	⬇️
src/auth/user.ts	49.19% <75.00%> (+1.47%)	⬆️
src/auth/index.ts	78.84% <100.00%> (+0.41%)	⬆️

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