feat: add vercel-kv driver

[danielroe]

This adds a new driver (based on the redis driver) for the Vercel KV store.

See https://vercel.com/docs/storage/vercel-kv for an implementation

For a demo, see https://github.com/danielroe/vercel-kv, and you can hit https://vercel-kv.vercel.app/api/kv for a response rendered using the KV store.

[nuxt-studio]

✅ Live Preview ready!

Name	Edit	Preview	Latest Commit
unstorage	Edit on Studio ↗︎	View Live Preview	252fbe0

[codecov]

Codecov Report

Merging #213 (d812f1d) into main (305472c) will increase coverage by 0.19%.
The diff coverage is 100.00%.

❗ Current head d812f1d differs from pull request most recent head 252fbe0. Consider uploading reports for the commit 252fbe0 to get more accurate results

@@            Coverage Diff             @@
##             main     #213      +/-   ##
==========================================
+ Coverage   80.36%   80.56%   +0.19%     
==========================================
  Files          24       24              
  Lines        2633     2634       +1     
  Branches      462      443      -19     
==========================================
+ Hits         2116     2122       +6     
+ Misses        516      511       -5     
  Partials        1        1              

Impacted Files	Coverage Δ
src/index.ts	100.00% <100.00%> (+3.57%)	⬆️

... and 3 files with indirect coverage changes

[pi0]

Two more things:

• There is a file listing supported drivers in src dir we shall include vercel for types and nitro support out of the box
• Should we also introduce upstash in next steps as an standalone driver?

[danielroe]

Should we also introduce upstash in next steps as an standalone driver?

great idea!

There is a file listing supported drivers in src dir we shall include vercel for types and nitro support out of the box

do you think we should add @vercel/kv dep to nitro directly?

[Intevel]

Looks great - Good work on this 👯

[Intevel]

@danielroe What do you think about adding this to the Nuxt 3 Documentation? To the Vercel Deployment?

[pi0]

Driver tests to be added later (as well as upstash provider. they are almost identical!)

[pi0]

Followup #218