Create a Data File Header Definition format referenceable form ISA Assay Tables.

[proccaserra]

• discussed by @muehlhaus and @cpommier
• relates to #473
• the idea is to allow referencing of a file structure description (data dictionary of the filed header) from an ISA Assay.
• https://git.nfdi4plants.org/explore

[muehlhaus]

I started a discussion to discuss ideas to solve this issue: ISA Model Extension - DataSet #484