feat: Add generic assayapp featuring dynamic links

[sellth]

This is a test balloon for implementing a new dynamic way of defining SODAR data links. This assayapp is only active when specifically called via the Comment[SODAR Assay Plugin] line in i_Investigation.txt. Further special comments define columns which should link to different collections.

• [x] Comment[SODAR Assay Plugin ResRep]: Links columns to Results & Reports
• [x] Comment[SODAR Assay Plugin MiscFiles]: Links columns to MiscFiles
• [x] Comment[SODAR Assay Plugin Data1/2/3]: Creates row links to a three-tiered folder structure in iRODS.
• [x] Comment[SODAR Assay Plugin RowPath]: Create links to data collections defined by previous comment.
• [x] Toggle display row links via comment (eed609e76da465ea657d7ed859a3343702667365)
• [x] docs

Involving @shubavarshini and @mikkonie right from the start to get feedback.

[sellth]

Added row-link generation for three-level data collection structure. Do we need to also care about Material columns i.e. top_header shenanigans?

[sellth]

@mikkonie @shubavarshini I believe we're ready. Main changes are naming of the comments and adding docs.