Add ciri2 module

[razmia02]

PR checklist

Closes #XXX

• This comment contains a description of changes (with reason).
• 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.
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• Use BioConda and BioContainers if possible to fulfil software requirements.
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  • For modules:
    • nf-core modules test <MODULE> --profile docker
    • nf-core modules test <MODULE> --profile singularity
    • nf-core modules test <MODULE> --profile conda
  • For subworkflows:
    • nf-core subworkflows test <SUBWORKFLOW> --profile docker
    • nf-core subworkflows test <SUBWORKFLOW> --profile singularity
    • nf-core subworkflows test <SUBWORKFLOW> --profile conda

[razmia02]

This PR is ready for review. Passed nf-core modules test.
For test data: CIRI2 specifically requires unsorted sam files generated by bwa-mem with -T 19 flag. Although I have tested the module with alreday available testdata from nf-core repo, I have also submitted PR for the CIRI2's own test data.
Test data PR: https://github.com/nf-core/test-datasets/pull/2159.

[mashehu]

Please join the github org via the slack channel so the CI runs for you.