Abillity to add buttons next to (expressions / text / enum) form fields and trigger some endpoint / external URL / fn / refresh

[nikos445]

Feature:

• Abillity to add buttons next expressions / text / enum and trigger some endpoint / external URL
• Additionally, Buttons can be programmed to execute some expression.

Use case example:

• Button next to free text field, to request an API endpoint for adding data to database.
• Authentication shall be considered also like fn.advancdRest()...