Adds litlogger integration

[justusschock]

What does this PR do?

Integrates LitLogger as a first-class logger to pytorch-lightning.

Users will be able to log directly to lightning.ai from pytorch_lightning without any additional setup.

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• Did you list all the breaking changes introduced by this pull request?
• Did you update the CHANGELOG? (not for typos, docs, test updates, or minor internal changes/refactors)

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---

📚 Documentation preview 📚: https://pytorch-lightning--21430.org.readthedocs.build/en/21430/

[github-actions]

⚡ Required checks status: All passing 🟢

Groups summary

🟢 pytorch_lightning: Tests workflow

Check ID	Status
pl-cpu-guardian	success	✅

These checks are required after the changes to requirements/pytorch/loggers.info, src/lightning/pytorch/loggers/__init__.py, src/lightning/pytorch/loggers/litlogger.py, src/lightning/pytorch/trainer/connectors/callback_connector.py, src/lightning/pytorch/trainer/connectors/logger_connector/logger_connector.py, tests/tests_pytorch/loggers/conftest.py, tests/tests_pytorch/loggers/test_litlogger.py.

🟢 pytorch_lightning: lit GPU

Check ID	Status
pytorch.yml / Lit Job (nvidia/cuda:12.1.1-devel-ubuntu22.04, pytorch, 3.10)	success	✅
pytorch.yml / Lit Job (lightning, 3.12)	success	✅
pytorch.yml / Lit Job (pytorch, 3.12)	success	✅

These checks are required after the changes to requirements/pytorch/loggers.info, src/lightning/pytorch/loggers/__init__.py, src/lightning/pytorch/loggers/litlogger.py, src/lightning/pytorch/trainer/connectors/callback_connector.py, src/lightning/pytorch/trainer/connectors/logger_connector/logger_connector.py, tests/tests_pytorch/loggers/conftest.py, tests/tests_pytorch/loggers/test_litlogger.py.

🟢 Benchmarks

Check ID	Status
benchmark.yml / Lit Job (fabric)	success	✅
benchmark.yml / Lit Job (pytorch)	success	✅

These checks are required after the changes to requirements/pytorch/loggers.info, src/lightning/pytorch/loggers/__init__.py, src/lightning/pytorch/loggers/litlogger.py, src/lightning/pytorch/trainer/connectors/callback_connector.py, src/lightning/pytorch/trainer/connectors/logger_connector/logger_connector.py.

🟢 fabric: Docs

Check ID	Status
docs-make (fabric, doctest)	success	✅
docs-make (fabric, html)	success	✅

These checks are required after the changes to docs/source-fabric/conf.py, docs/source-fabric/glossary/index.rst, docs/source-fabric/guide/loggers/litlogger.rst, docs/source-fabric/guide/logging.rst.

🟢 pytorch_lightning: Docs

Check ID	Status
docs-make (pytorch, doctest)	success	✅
docs-make (pytorch, html)	success	✅

These checks are required after the changes to src/lightning/pytorch/loggers/__init__.py, src/lightning/pytorch/loggers/litlogger.py, src/lightning/pytorch/trainer/connectors/callback_connector.py, src/lightning/pytorch/trainer/connectors/logger_connector/logger_connector.py, docs/source-pytorch/api_references.rst, docs/source-pytorch/conf.py, docs/source-pytorch/extensions/logging.rst, docs/source-pytorch/visualize/supported_exp_managers.rst, requirements/pytorch/loggers.info.

🟢 mypy

Check ID	Status
mypy	success	✅

These checks are required after the changes to requirements/pytorch/loggers.info, src/lightning/pytorch/loggers/__init__.py, src/lightning/pytorch/loggers/litlogger.py, src/lightning/pytorch/trainer/connectors/callback_connector.py, src/lightning/pytorch/trainer/connectors/logger_connector/logger_connector.py.

🟢 install

Check ID	Status
install-pkg-guardian	success	✅

These checks are required after the changes to src/lightning/pytorch/loggers/__init__.py, src/lightning/pytorch/loggers/litlogger.py, src/lightning/pytorch/trainer/connectors/callback_connector.py, src/lightning/pytorch/trainer/connectors/logger_connector/logger_connector.py, requirements/pytorch/loggers.info.

---

Thank you for your contribution! 💜

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[codecov]

Codecov Report

❌ Patch coverage is 92.55319% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 79%. Comparing base (a6701aa) to head (1d27dc8).
⚠️ Report is 1 commits behind head on master.
✅ All tests successful. No failed tests found.

❗ There is a different number of reports uploaded between BASE (a6701aa) and HEAD (1d27dc8). Click for more details.

HEAD has 395 uploads less than BASE

Flag	BASE (a6701aa)	HEAD (1d27dc8)
cpu	120	29
lightning	60	14
pytest	60	0
python3.11	24	6
lightning_fabric	30	0
python3.12	36	9
python3.10	12	3
python3.12.7	36	8
python	12	3
pytorch2.2.2	6	3
pytest-full	60	29
pytorch2.1	12	6
pytorch2.3	6	3
pytorch2.9	6	3
pytorch_lightning	30	15
pytorch2.5.1	6	3
pytorch2.4.1	6	2
pytorch2.8	6	3
pytorch2.7	6	3
pytorch2.6	6	3

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #21430     +/-   ##
=========================================
- Coverage      87%      79%     -8%     
=========================================
  Files         269      267      -2     
  Lines       23875    24004    +129     
=========================================
- Hits        20689    18952   -1737     
- Misses       3186     5052   +1866     

[williamFalcon]

Been waiting 7 years for this lol

https://github.com/williamFalcon/test-tube