More forgiving HTTP version detection

[itowlson]

We detect a couple of supported RCs of wasi:http, plus releases 0.2.0 and 0.2.1. However, the wasi crate (https://docs.rs/wasi/latest/wasi/) has already moved on to 0.2.2, and will presumably move on to 0.2.3 etc. in other minor versions. This means users of the wasi crate in Spin apps have to pin to an exact patch version instead of the 0.13 minor version (see fermyon/leptos-spin#48 (comment)).

What would be the practicalities of enabling all 0.2 versions of wasi:http, present and future?

cc @alexcrichton

[alexcrichton]

Ah yes I had forgotten about the explicit checks that Spin performs around here which will need to be relaxed yeah to support any 0.2.* version