add a sourmash module

[fmalmeida]

Add an additional module for scanning the sample using sourmash:

• [x] scan against refseq using whole genome (LCA)
• [x] an option to create a simple phylogeny using sourmash against the N closest genomes detected in the pipeline using refseq_masher module or against genomes provided by user in a directory
• [ ] Include results in HTML reports

[fmalmeida]

Just missing addition in the reports.

[fmalmeida]

Module working fine in workflow. HTML reports containing desired results. Missing:

• [x] publish docker image
• [x] generating and publishing new pre-built database
• [x] updating HTML reports examples in documentation for new ones with sourmash

[fmalmeida]

Finally opened PR for final review before releasing: https://github.com/fmalmeida/bacannot/pull/125