Bump wit-bindgen

[jakehemmerle]

The latest version of cargo-component includes a small wit spec change where semicolons are required after certain statements (eg EOL of package and export declarations). Short term patch fix is to install an older version of cargo-component via cargo install cargo-component --version 0.2.0.

Latest versions of wit-bindgen have removed the macro_export macro parameter. I did not look thoroughly, but it appears that there is no new parameter replacement for it. If we cannot export the generated macro, there may be some refactoring and restructuring that increases the scope here, and a new issue may need to be opened.

TODO:

• Bump ec-core's wit-bindgen to latest version
• Fix wit-bindgen related macro issues (eg macro_export error)
• Fix .wit declarations as the loud compile-time errors describe
• Confirm an example program can be compiled via cargo component build...
• Remove the --version 0.2.0 patch-fix from README.md

Bonus:

• Change ec-core to depend on workspace version of wit-bindgen