split aws lambda into multiple presets

[danielroe]

Context: https://github.com/unjs/nitro/pull/357#issuecomment-1247562089, https://github.com/unjs/nitro/issues/504

Currently we cover AWS v1, AWS v2 and Netlify, but not all responses are valid between the different versions.

(We could also return different returns based on detecting the type of the request.)