Add coverm/contig and coverm/genome as options for calculating read alignment metrics

[Carson J Miller]

Description of feature

Add CoverM to calculate read alignment metrics for contig/bin alignments

Tasks

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1. Add coverm/contig to nf-core/modules
2. Add coverm/genome to nf-core modules
3. Add coverm/contig and coverm/genome to nf-core/mag