[data] data metrics grouping (ray-project#55495)

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https://github.com/user-attachments/assets/8caa7448-35b1-4945-9e41-82fd9efca4f3

## Why are these changes needed?
- ray data dashboard is ugly
- grouping them into pending inputs, inputs, outputs, overview, pending
outputs, scheduling loop, resource usage/budget, and iteration
- also changed the metric from external outqueue of op1 to external
inqueue of op2 (so that i can combine the internal + external inqueues
easily)
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solves. -->

## Related issue number

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## Checks

- [ ] I've signed off every commit(by using the -s flag, i.e., `git
commit -s`) in this PR.
- [ ] I've run `scripts/format.sh` to lint the changes in this PR.
- [ ] I've included any doc changes needed for
https://docs.ray.io/en/master/.
- [ ] I've added any new APIs to the API Reference. For example, if I
added a
method in Tune, I've added it in `doc/source/tune/api/` under the
           corresponding `.rst` file.
- [ ] I've made sure the tests are passing. Note that there might be a
few flaky tests, see the recent failures at https://flakey-tests.ray.io/
- Testing Strategy
   - [ ] Unit tests
   - [ ] Release tests
   - [ ] This PR is not tested :(

---------

Signed-off-by: iamjustinhsu <jhsu@anyscale.com>
Signed-off-by: Andrew Grosser <dioptre@gmail.com>

Author: iamjustinhsu