feature(annotation): Add GTDB MMesqs2-Taxonomy database

[bosterholz]

Please provide a description for this PR

This PR adds the newest GTDB database as an additional database for MMseqs2-Taxonomy annotations. Also a new flag to (not) use the MMseqs2-Taxonomy RAM mode is implemented.

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[pbelmann]

I agree with all changes. However, based on this PR I implemented in PR #325 a few modifcations to make it more consistent with gtdbtk and EMGB. Let's continue the review in PR #325.

[pbelmann]

Merged with PR #325