Add module for metacells analysis

[jashapiro]

Purpose/implementation Section

Please link to the GitHub issue that this pull request addresses.

Closes #598

What is the goal of this pull request?

The goal for this PR is mostly to establish the initial infrastructure for analysis, including the environment for future analysis.

Briefly describe the general approach you took to achieve this goal.

The general path that ended up working for determining requirements was to start with a pip install of SEACells, then move packages from pip to conda control one at a time. The packages that remain in pip install fine there, but in some cases did not have conda packages for all systems

If known, do you anticipate filing additional pull requests to complete this analysis module?

Yes, many!

Provide directions for reviewers

What are the software and computational requirements needed to be able to run the code in this PR?

Everything should be available through conda and pip at this stage

Are there particularly areas you'd like reviewers to have a close look at?

If you would like to test that the packages build and install locally, that would be fine, but I also expect to catch any such errors through future testing, and I expect some small environment changes before much code is added.

Is there anything that you want to discuss further?

Author checklists

Analysis module and review

• This analysis module uses the analysis template and has the expected directory structure.
• The analysis module README.md has been updated to reflect code changes in this pull request.
• The analytical code is documented and contains comments.
• Any results and/or plots this code produces have been added to your S3 bucket for review.

Reproducibility checklist

• Code in this pull request has been added to the GitHub Action workflow that runs this module.
• The dependencies required to run the code in this pull request have been added to the analysis module Dockerfile.
• If applicable, the dependencies required to run the code in this pull request have been added to the analysis module conda environment.yml file.
• If applicable, R package dependencies required to run the code in this pull request have been added to the analysis module renv.lock file.

[allyhawkins]

LGTM. I didn't test the environment build, but as you said in your PR some of those things will come out as you get started on things. Onward to getting Metacells 🚀