Source Salesforce: add formula field values + additional metadata

[InbarShirizly]

What area the feature impact?

Connectors

Revelant Information

As part of the salesforce connector we would like to be able to get:

1. What are the custom field functions (or the origin)
2. any metadata exists of column descriptions, table descriptions
3. Foreign keys that are connecting the tables

example of the usage of formulas in Fivetran: https://www.fivetran.com/blog/automatically-sync-formula-field-values-in-salesforce