Add dwcConcept and dwcDescription to schema config field

[CarolineDenis]

Fixes #6559

Warning

This PR affects database migrations. See migration testing instructions.

Checklist

• Self-review the PR after opening it to make sure the changes look good and
  self-explanatory (or properly documented)
• Add relevant issue to release milestone
• Add relevant documentation (Tester - Dev)
• Add a reverse migration if a migration is present in the PR

Testing instructions

• Open any table with schema config
• Verify there is now a form field in the right column named Darwin Core Concept for each field and relationship
• Verify there is now a form field in the right column named Darwin Core Concept Description for each field and relationship
• Verify that the concept and the description are readonly

NOTES:
The dwc concept and description fields are visible everywhere for now (just for testing). Once I added the value for certain of them those two fields will only appear when there is a concept available.

[CarolineDenis]

to change