mise tasks: machine-readable (json) output

[mkhl]

I know tasks are experimental and this is probably coming anyway but just to be sure:
I'd love mise tasks to be able to generate machine-readable output, like the json output of mise env (so other tools can pick up the listing and invoke tasks through mise)

[jdx]

there are probably several commands that would benefit from this, mise plugins is another one that came up today. This is really easy to implement if someone wants to learn a bit of rust, see https://github.com/jdx/mise/blob/main/src/cli/outdated.rs for a good example on --json output.