Remove wasi-common from runner crate

[jeffcharles]

Description of the change

Switch from wasi-common to wasmtime-wasi in runner crate. This change includes taking stdin in tests as Vec<u8> instead of a byte slice because MemoryInputStream::new takes a Vec<u8> instead of a byte slice. I've also deleted LogWriter because MemoryOutputStream accepts a capacity limit as an argument.

Why am I making this change?

We want to standardize on using wasmtime-wasi.

Checklist

• I've updated the relevant CHANGELOG files if necessary. Changes to javy-cli and javy-plugin do not require updating CHANGELOG files.
• I've updated the relevant crate versions if necessary. Versioning policy for library crates
• I've updated documentation including crate documentation if necessary.