New module: scvitools/solo single-cell doublet detection

[LeonHafner]

PR checklist

• If you've fixed a bug or added code that should be tested, add tests!
• If you've added a new tool - have you followed the module conventions in the contribution docs
• If necessary, include test data in your PR.
• Remove all TODO statements.
• Emit the versions.yml file.
• Follow the naming conventions.
• Follow the parameters requirements.
• Follow the input/output options guidelines.
• Add a resource label

[LeonHafner]

@nf-core-bot fix linting

[LeonHafner]

Module is producing inconsistent hashes for the output anndata object across two nf-test runs.

[nictru]

Ideas for removing sources of randomness

[nictru]

Things left to be done:

• Remove unnecessary seeds
• Update scvi-tools version and remove batch stuff