dsh-toml: TOML ↔ JSON Conversion Plugin

`uckkk/dsh-toml` is a pure Node.js implementation of a DSH plugin that converts between TOML and JSON offline, making it particularly suitable for handling mixed-format configurations. Users can install it with `dsh plugin add dsh-toml` and enable it in `package.json`. This plugin supports Cordis Patch and runs local code with the permissions of the current process. When installing third-party plugins, it is important to review their source code and licenses.