update dada2 reference data

[bernt-matthias]

Still have some doubts if I choose the correct reference data: benjjneb/dada2#2053 (comment)

Main question is if the ...toSpecies datasets can/should be used (currently we would download the ..toGenus datasets.

For gtdb and RefSeq_RDP datasets there are again different naming schemes and I do not yet know if the genus one is the correct one (the also need to be added to the tool form).

Edit: Was clarified in the linked issue for the maintained DBs. I decided to go only for those (for now).

FOR CONTRIBUTOR:

• I have read the CONTRIBUTING.md document and this tool is appropriate for the tools-iuc repo.
• License permits unrestricted use (educational + commercial)
• This PR adds a new tool or tool collection
• This PR updates an existing tool or tool collection
• This PR does something else (explain below)

[bernt-matthias]

Now the entries for the dada2_taxonomy and dada2_species datatables do not match up. Need to restructure the whole thing.