update Wasmtime and WASIp3 WITs, etc. (#211)

* support multiple `-w` options; update to latest Wasmtime

This also updates the WASIp3 examples and WIT files to use the latest RC.

* add `--full-names` option and refactor public API

`clippy` finally convinced me there were too many arguments to the
`componentize` function, so now we have methods on structs with named fields
instead.

Also, print all known worlds and WIT paths if the specified world can't be
found.

* fix python.rs build

* add new WIT files

* pin mypy version used for tests

* bump Wasmtime version in test.yaml

Author: dicej

.github/workflows/test.yaml

@@ -134,7 +134,7 @@ jobs:
 
       - uses: taiki-e/install-action@v2
         with:
-          tool: wasmtime-cli@41.0.3
+          tool: wasmtime-cli@43.0.0
 
       - uses: actions/setup-python@v5
         with:

.gitignore

@@ -12,6 +12,7 @@ examples/http/.spin
 examples/http/http.wasm
 examples/http/proxy
 examples/http/poll_loop.py
+examples/http-p3/http.wasm
 examples/tcp-p3/tcp.wasm
 examples/tcp/tcp.wasm
 examples/tcp/command