dsh-5: JSON5 Parsing and Serialization

`dsh-5` (formerly `dsh-json5`) is a locally run DSH plugin maintained by `uckkk`, providing JSON5 parsing and serialization capabilities without relying on external network services. It supports handling JSON data that includes comments or trailing commas. The installation command is `dsh plugin add dsh-5`. Please note that installing it runs third-party code on your local machine, so review the source code yourself.