Add Weights & Biases (W&B) Fabric Logger

[ash0ts]

What does this PR do?

• Port the logic of the lightning.pytorch.loggers.WandbLogger into lightning.fabric.loggers.WandbLogger.
• Added tests to ensure both the current pytorch logger and fabric logger both pass the same test suite as when it was just the pytorch logger
• Added stripped down version of identical tests from the pytorch logger for the fabric logger without any pytorch specific functionality

Fixes #17885

Before submitting

• Was this discussed/agreed via a GitHub issue? (not for typos and docs)
• Did you read the contributor guideline, Pull Request section?
• Did you make sure your PR does only one thing, instead of bundling different changes together?
• Did you make sure to update the documentation with your changes? (if necessary)
• Did you write any new necessary tests? (not for typos and docs)
• Did you verify new and existing tests pass locally with your changes?
• 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)

PR review

Anyone in the community is welcome to review the PR.
Before you start reviewing, make sure you have read the review guidelines. In short, see the following bullet-list:

Reviewer checklist

• Is this pull request ready for review? (if not, please submit in draft mode)
• Check that all items from Before submitting are resolved
• Make sure the title is self-explanatory and the description concisely explains the PR
• Add labels and milestones (and optionally projects) to the PR so it can be classified

---

📚 Documentation preview 📚: https://pytorch-lightning--19077.org.readthedocs.build/en/19077/

[ash0ts]

I'm having difficulty adding in the resultant docs page for the API on the logger if anyone is able to assist!

[ash0ts]

@awaelchli I noticed some failing tests. Would love discuss how I can get these resolved!

[ash0ts]

Is there anything I can pointedly fix here? Would love to discuss!

[codecov]

Codecov Report

Merging #19077 (9b8e84a) into master (41503fc) will decrease coverage by 38%.
Report is 1 commits behind head on master.
The diff coverage is 80%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #19077      +/-   ##
==========================================
- Coverage      84%      45%     -38%     
==========================================
  Files         445      441       -4     
  Lines       37289    37395     +106     
==========================================
- Hits        31185    16981   -14204     
- Misses       6104    20414   +14310     

[ash0ts]

Hey! @Borda sorry for the bump. Hope your holidays are/were lovely. Would love to discuss what can be fixed to merge this!

[ash0ts]

@awaelchli @Borda Would love to see what I can do to fix the failing docs test! Would also love to discuss if there are any other errors that need fixing if they exist

[ash0ts]

docstring of lightning.fabric.loggers.wandb.WandbLogger:227:py:class reference target not found: wandb.sdk.wandb_run.Run

This specific error is being raised by Sphinx however in my Fabric docstrings I do not refer to :class: wandb.sdk.wandb_run.Run outside of TypeChecks

[gitguardian]

⚠️ GitGuardian has uncovered 2 secrets following the scan of your pull request.

Please consider investigating the findings and remediating the incidents. Failure to do so may lead to compromising the associated services or software components.

🔎 Detected hardcoded secrets in your pull request

GitGuardian id	Secret	Commit	Filename
-	Generic High Entropy Secret	78fa3af	tests/tests_app/utilities/test_login.py	View secret
-	Base64 Basic Authentication	78fa3af	tests/tests_app/utilities/test_login.py	View secret

🛠 Guidelines to remediate hardcoded secrets

1. Understand the implications of revoking this secret by investigating where it is used in your code.
2. Replace and store your secret safely. Learn here the best practices.
3. Revoke and rotate this secret.
4. If possible, rewrite git history. Rewriting git history is not a trivial act. You might completely break other contributing developers' workflow and you risk accidentally deleting legitimate data.

To avoid such incidents in the future consider

• following these best practices for managing and storing secrets including API keys and other credentials
• install secret detection on pre-commit to catch secret before it leaves your machine and ease remediation.

---

<sup>🦉 GitGuardian detects secrets in your source code to help developers and security teams secure the modern development process. You are seeing this because you or someone else with access to this repository has authorized GitGuardian to scan your pull request.

Our GitHub checks need improvements? Share your feedbacks!</sup>

[awaelchli]

Closing in favor of #19451
Great work adding it to wandb as an integration!