Improve the types of task arguments

[alcuadrado]

When creating the first few tasks we noticed that our types within actions are pretty annoying, as the task arguments are typed as Record<string, unknown>.

We could infer a mostly complete type for the task arguments doing something like this.

We would infer the types of arguments that are available in that task definition/override and use Record<string, any> for anything else. This sounds like a reasonable trade-off.