## Summary
This PR starts the process of adding debug task locators to Zed's
debugger system. A task locator is a secondary resolution phase that
allows a debug task to run a command before starting a debug session and
then uses the output of the run command to configure itself.
Locators are most applicable when debugging a compiled language but will
be helpful for any language as well.
## Architecture
At a high level, this works by adding a debug task queue to `Workspace`.
Which add's a debug configuration associated with a `TaskId` whenever a
resolved task with a debug config is added to `TaskInventory`'s queue.
Then, when the `SpawnInTerminal` task finishes running, it emits its
task_id and the result of the ran task.
When a ran task exits successfully, `Workspace` tells `Project` to start
a debug session using its stored debug config, then `DapStore` queries
the `LocatorStore` to configure the debug configuration if it has a
valid locator argument.
Release Notes:
- N/A
Piotr Osiewicz
Anthony Eid