Have the configuration page display google console projects and vertex AI data stores

Problem/Motivation

Right now you have to manually fill in the google console project, data stores and so on. With the credentials file it might be possible to lookup the list of the projects the credentials have access to and provide like a drop-down to select them and then do the same for the data stores after a lookup based on the project.

User interface changes

Adding additional drop-downs to the configuration page to select google console project and data stores.