Add gcta/makegrm module

[lyh970817]

This PR adds the gcta/makegrm module, which computes a whole GCTA genetic relationship matrix from PLINK inputs.

It is intended for workflows that need a dense GRM without the partitioned output naming used by gcta/makegrmpart.

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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• Follow the input/output options guidelines.
• Add a resource label
• Use BioConda and BioContainers if possible to fulfil software requirements.
• nf-core modules test gcta/makegrm --profile docker
• nf-core modules test gcta/makegrm --profile singularity
• nf-core modules test gcta/makegrm --profile conda