[prettier-plugin-toml] Change from taplo to tombi #517

The TOML formatter is based on "taplo", which is effectively abandoned, and has many bugs. For example, I encountered the bug in #487 which I doubt will ever be fixed upstream.

The community has moved to "tombi". Many other tools which depend on TOML support have moved to tombi.

Maybe this plugin can use that instead? It would address various bugs, be fully supported, and maybe even provide new functionalities.

Thanks for considering it!