forked from extern/nushell
This restores a basic version of the `post` command. Some source types have been omitted from this first take. I copied from `fetch` and from `post`@0.40.0. Part of #4356
This restores a basic version of the `post` command. Some source types have been omitted from this first take. I copied from `fetch` and from `post`@0.40.0. Part of #4356