Describe the sequencing protocol within the preparation information

[wasade]

It would be nice for preparation information files to have a reserved column, perhaps qiita_protocol_types, which contains list[str] to describe the associated protocols. The terms for a protocol ideally are an enum and enforced. The primary need is to represent protocol information from the SPP, such as [EMP16S, KatharoSeq], where we always know the detail and it can be inherited from the sample sheet. Supporting this in the general case for studies created outside of the SPP would be great, but hard to cover the variations and we have less trust