feat: getMount and getMounts utils

[pi0]

Resolves #53 (getMount)

Resolves #52 (getMounts)

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unstorage	✅ Ready (Inspect)	Visit Preview	Feb 28, 2023 at 8:14PM (UTC)

[codecov]

Codecov Report

Merging #167 (535a4f3) into main (b0e64a9) will increase coverage by 0.16%.
The diff coverage is 95.65%.

❗ Current head 535a4f3 differs from pull request most recent head 6d76773. Consider uploading reports for the commit 6d76773 to get more accurate results

@@            Coverage Diff             @@
##             main     #167      +/-   ##
==========================================
+ Coverage   79.09%   79.26%   +0.16%     
==========================================
  Files          22       22              
  Lines        2263     2286      +23     
  Branches      398      401       +3     
==========================================
+ Hits         1790     1812      +22     
- Misses        473      474       +1     

Impacted Files	Coverage Δ
src/storage.ts	90.63% <94.44%> (+0.19%)	⬆️
src/types.ts	100.00% <100.00%> (ø)

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