ENH: add fetch-busco-db action and update evaluate-busco accordingly

[Sann5]

At the moment, the action evaluate-busco downloads data from the internet and uses it to identify BUSCO genes in the analyzed sequences. There is a need to change this, such that the download happens before the BUSCO analysis.

Objectives of this enhancement:

1. Create a new action (fetch-busco-db) that fetches this data and stores it in an artifact.
2. Modify evaluate-busco such that it takes the output of fetch-busco-db as input.

Tasks

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1. ENH: Semantic Type for fetch-busco-db's output q2-types-genomics#74
   enhancement +1
   
2. BUG: composite semantic type in TypeMap where child type has properties; breaks CLI qiime2/qiime2#748
   bug-sev:3|medium bug-type:2|workaround-req +2

Useful for the fetch-busco-db implementation:

• Example of TypeMap in q2-amr
• Multiple properties in a ST