Allow invocation of `foo.super` tasks from the command line (500USD Bounty)

[lihaoyi]

---

From the maintainer Li Haoyi: I'm putting a 500USD bounty on this issue, payable by bank transfer on a merged PR implementing this.

See https://github.com/orgs/com-lihaoyi/discussions/6 for other bounties and the terms and conditions that bounties operate under

---

We already give them unique selectors and paths on disk, should be possible to make them callable as well. This could be useful for debugging

We should be able to say ./mill foo.bar.super if there is only one overridden task, or if there are multiple overridden tasks then ./mill foo.bar.super.qux.Baz where qux.Baz is the super-suffix computed in mill.define.internal.OverrideMapping.assignOverridenTaskSegments (basically the partially-qualified class name long enough to uniquely define the defining class of the task)

[jseteny]

@lihaoyi I start to work on this

[jseteny]

@lihaoyi I did not really progress with this and stopped to work on it.

[rekudyu]

hey @lihaoyi I would like to work on this.