gh-507: Pull request to integrate mg binned boost emulator

[sankarshana16]

🚀 Pull Request Checklist

✅ Summary

This pull request is for the integration of the binned mg emulator (https://github.com/sankarshana16/mg_binned_boost_emulator) into Cloelib.

🔄 Changes

• Added mg_emulator python file that wraps the emulator and provides the matter power spectrum, linear growth factor, growth rate and sigma_8 according the Cloelib structure.
• Modified photo,py to modify lensing, i.e., re-weight it by \Sigma, which is provided in input to the emulator.

🛠 How to Test

📝 Documentation

• This PR does not require documentation changes

✅ PR Checklist for Developers

• I have titled this PR before merging as "gh-#:", where "#" represents the task it closes
• I have run locally pre-commit using pre-commit run --all-files
• I have tested my changes locally
• No new warnings or errors introduced
• I have updated documentation (if applicable)
• My changes do not introduce breaking changes (i.e: the package still gets installed)
• I have added unit tests (if applicable)
• I have consistently updated the GitHub information for the project, including milestones, task types, and other relevant details.

✅ PR Checklist for Reviewers

• The next PR targets the correct branch
• CI tests have run and passed for the latest commit on the source branch
• Check that the code can still be installed if new packages are imported
• If necessary, the notebooks in the playground will be updated in a corresponding follow-up PR
• Coverage percentage is retained or increased
• Quality of new/changed code is acceptable
• Quality of new/changed unit tests is acceptable
• No data files have been included in the commits
• Implementation follows the agreed task description point by point
• Check that any added folder/file has been added to the README.md file
• Check that the documentation has been updated accordantly
• Check that the corresponding branch has been deleted after merging. If not, delete it

[gcanasherrera]

@sankarshana16 make sure that there is a task associated to this PR. Also, why have you changed the template for developers? :D

Change the title of this PR.
Docs still need to be adjusted (also README).

[gcanasherrera]

Pull from the main. This should solve the BNT issue.

[gcanasherrera]

This doesn't belong here. Modify the docs.

[sankarshana16]

Okay, I've moved the file to the docs folder.

[sankarshana16]

I've also merged with main now, all checks have passed! :-D

[gcanasherrera]

This is not what I meant. What I meant is that you need to update cloelib docs as a whole, including this.

Could you please check out how #493 is currently updating the docs? @ivansladoljev can give you a hand

[sankarshana16]

Okay, I've fixed the developers checklist too.
I thought we were supposed to only leave those points that are ticked in! My bad