Remove wasi supports of plugin system

[CPunisher]

Currently wasmer introduces too many crates to support features like io and networks. However, it would be better if plugins only do pure transformation. We may try to disable all unnecessary abilities of the plugin runtime.

I'm not sure currently how many plugins or which part of the swc plugin runtime are relying on these. To avoid breaking changes, we may first introduce a cargo feature to do that.

cc @kdy1 @kwonoj

[chenjiahan]

Considering that wasmer introduces a lot of dependencies, this change should be of great help in optimizing the binary size of @swc/core and @rspack/core.

[kdy1]

I like the idea. I think we should experiment first, though.

Some plugins may want to access local files.

[hardfist]

I want to try disable network first in rspack

[kdy1]

It would be nice to disable it for @swc/core, too