fix(readBody, readRawBody): handle raw body as buffer

[johannschopplich]

• Closes readBody needs to handle Buffer #363

I'm not sure if this implementation is enough. For my use-case in nuxt-api-party:

// https://github.com/johannschopplich/nuxt-api-party/blob/main/src/runtime/server.ts#L26
let _body = await readBody<EndpointFetchOptions>(event)

// Inconsistent `readBody` behavior in some Nitro presets
// https://github.com/unjs/nitro/issues/912
if (Buffer.isBuffer(_body))
  _body = destr((_body as Buffer).toString())

… this change fixed handling Buffer requests, e.g. when sending POST requests in a Cloudflare Nitro worker.

[pi0]

Thanks for the PR. I have pushed couple of changes to handle it also for readRawBody consistently + tests

[codecov]

Codecov Report

Merging #366 (cb7a486) into main (ba64f60) will increase coverage by 0.19%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #366      +/-   ##
==========================================
+ Coverage   74.57%   74.77%   +0.19%     
==========================================
  Files          26       26              
  Lines        2407     2406       -1     
  Branches      380      381       +1     
==========================================
+ Hits         1795     1799       +4     
+ Misses        612      607       -5     

Impacted Files	Coverage Δ
src/utils/body.ts	92.62% <100.00%> (+4.00%)	⬆️

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[pi0]

Related fix 19d133d