Rename 'report'

[khaeru]

• Use preferred module names:
  • message_ix.reporting → message_ix.report
  • reporting.computations → report.operator
  • Install an ixmp.util.DeprecatedPathFinder that supports imports from previous locations and raises DeprecationWarning.
  • Adjust imports within message_ix, tutorials, and references in docs.
• Improve documentation:
  • Address Sphinx nitpicks.
  • Add .. automodule:: message_ix for the top-level module; this allows other projects to link to :mod:'message_ix' directly through intersphinx.
• Improve the MESSAGE, MACRO, and MESSAGE_MACRO model classes, as enabled by iiasa/ixmp#500:
  • Include all items (including var and equ) in explicit lists of model items.
  • Add descriptions for items.
  • Derive reporting settings (RENAME_DIMS) from .models.
• Simplify report/__init__.py.

How to review

• Read the diff.
• Note the CI checks all pass.
• View the documentation, including what's new/migration notes, and ensure the changes are described clearly.

PR checklist

• [x] Continuous integration checks all ✅
• [x] Add or expand tests; coverage checks both ✅
• [x] Add, expand, or update documentation.
• [x] Update release notes.

[codecov[bot]]

Codecov Report

Merging #761 (b988abf) into main (f360dc7) will increase coverage by 0.4%. The diff coverage is 99.3%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #761 +/- ## ======================================= + Coverage 94.3% 94.8% +0.4% ======================================= Files 43 43 Lines 3474 3797 +323 ======================================= + Hits 3279 3600 +321 - Misses 195 197 +2 ``` | [Files](https://app.codecov.io/gh/iiasa/message_ix/pull/761?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=iiasa) | Coverage Δ | | |---|---|---| | [message\_ix/\_\_init\_\_.py](https://app.codecov.io/gh/iiasa/message_ix/pull/761?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=iiasa#diff-bWVzc2FnZV9peC9fX2luaXRfXy5weQ==) | `91.6% <100.0%> (+1.1%)` | :arrow_up: | | [message\_ix/core.py](https://app.codecov.io/gh/iiasa/message_ix/pull/761?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=iiasa#diff-bWVzc2FnZV9peC9jb3JlLnB5) | `95.1% <100.0%> (ø)` | | | [message\_ix/macro.py](https://app.codecov.io/gh/iiasa/message_ix/pull/761?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=iiasa#diff-bWVzc2FnZV9peC9tYWNyby5weQ==) | `96.7% <100.0%> (+<0.1%)` | :arrow_up: | | [message\_ix/report/\_\_init\_\_.py](https://app.codecov.io/gh/iiasa/message_ix/pull/761?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=iiasa#diff-bWVzc2FnZV9peC9yZXBvcnQvX19pbml0X18ucHk=) | `100.0% <100.0%> (ø)` | | | [message\_ix/report/operator.py](https://app.codecov.io/gh/iiasa/message_ix/pull/761?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=iiasa#diff-bWVzc2FnZV9peC9yZXBvcnQvb3BlcmF0b3IucHk=) | `97.1% <100.0%> (ø)` | | | [message\_ix/report/pyam.py](https://app.codecov.io/gh/iiasa/message_ix/pull/761?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=iiasa#diff-bWVzc2FnZV9peC9yZXBvcnQvcHlhbS5weQ==) | `100.0% <ø> (ø)` | | | [message\_ix/tests/report/test\_operator.py](https://app.codecov.io/gh/iiasa/message_ix/pull/761?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=iiasa#diff-bWVzc2FnZV9peC90ZXN0cy9yZXBvcnQvdGVzdF9vcGVyYXRvci5weQ==) | `100.0% <100.0%> (ø)` | | | [message\_ix/tests/test\_feature\_storage.py](https://app.codecov.io/gh/iiasa/message_ix/pull/761?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=iiasa#diff-bWVzc2FnZV9peC90ZXN0cy90ZXN0X2ZlYXR1cmVfc3RvcmFnZS5weQ==) | `100.0% <ø> (ø)` | | | [message\_ix/tests/test\_macro.py](https://app.codecov.io/gh/iiasa/message_ix/pull/761?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=iiasa#diff-bWVzc2FnZV9peC90ZXN0cy90ZXN0X21hY3JvLnB5) | `100.0% <100.0%> (ø)` | | | [message\_ix/tests/test\_models.py](https://app.codecov.io/gh/iiasa/message_ix/pull/761?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=iiasa#diff-bWVzc2FnZV9peC90ZXN0cy90ZXN0X21vZGVscy5weQ==) | `100.0% <100.0%> (ø)` | | | ... and [8 more](https://app.codecov.io/gh/iiasa/message_ix/pull/761?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=iiasa) | |