feat: implement inputs and outputs hash based task skipping

[wolfv]

TODO:

• Glob needs to accept folder

[wolfv]

One thing I noted is that "globbing" folders doesn't work (e.g. build/). I think build/** will work just fine but we should also fix the mentioned case before merging.

[ruben-arts]

What doesn't work for me in the cpp-sdl example is:

pixi run start
rm .build -rf
pixi run start

[wolfv]

I fixed that issue - we were taking into account any .gitignore files as well as ignoring hidden folders.

[wolfv]

We now store the task cache under .pixi/task-cache/<env-name>-<task>.json.
It's just a "forward" mapping of these two variables, so any - in the env name pose no problem.

Things we should consider:

• changing the name of the task or environment will invalidate the cache - might be annoying when downloading large files?
• We could think about a fast-cache mode where we only check the existence of files

Maybe we should spend a few minutes thinking about these items, but IMO it's good to merge now.

[ruben-arts]

What doesn't work for me in the cpp-sdl example is:

pixi run start
rm .build -rf
pixi run start

This doesn't work yet. I tried adding outputs = [".build"] to the configure task but that didn't help.

It will error on not having the .build/bin/sdl_example in the start task but and the cache will be hit for the configure and build

Edit: This works now but only with .build/ instead of .build which I would like to both be working as it would have taken me some time to debug this.

[ruben-arts]

This will unwrap when a user accidentally add as file instead of a dir in the cwd

[ruben-arts]

Here aswell