Add gcta/addgrms module

[lyh970817]

This PR adds the gcta/addgrms module, which combines multiple GRMs listed in an MGRM manifest into a single dense GRM.

PR checklist

• 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.
• Remove all TODO statements.
• Broadcast software version numbers to topic: versions - See version_topics
• Follow the naming conventions.
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• Add a resource label
• Use BioConda and BioContainers if possible to fulfil software requirements.
• nf-core modules test gcta/addgrms --profile docker
• nf-core modules test gcta/addgrms --profile singularity
• nf-core modules test gcta/addgrms --profile conda

[famosab]

Duplicate of #8140 ? @lyh970817 can you check for overlap and if this is a duplicate close the older PR?

[lyh970817]

Duplicate of #8140 ? @lyh970817 can you check for overlap and if this is a duplicate close the older PR?

We're using the same programme but different functionalities so I believe there is no overlap.