Implement pre-task dispatching

[cartercanedy]

Implement dependency dispatching

Tasks can specify other tasks by label to execute before being executed, with each task waiting on a zero exit code before beginning or cancelling the remaining queued tasks on a non-zero exit code.

I couldn't find any issues that referenced this easily, but @osiewicz and I were discussing this in the context of pre-debug tasks,
but this feature should be generally available to all task types

Release Notes:

• Added pre-task task execution

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[cartercanedy]

@cla-bot check

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!

[zed-industries-bot]

	Warnings
⚠️	This PR is missing release notes. Please add a "Release Notes" section that describes the change: Release Notes: - Added/Fixed/Improved ... If your change is not user-facing, you can use "N/A" for the entry: Release Notes: - N/A

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[cartercanedy]

@osiewicz I'm still not done, but do you agree with the direction I'm going?

[osiewicz]

Hey @cartercanedy,
I'll take a review pass over your PR on Thursday. I hope that's ok

[cartercanedy]

The semantics of the changes are ready to get reviewed. I'll work on tests, clippy lints, fmt, etc. in the meantime

[cartercanedy]

I'm removing post-task dispatching from the scope of this PR to make the changes more manageable to review