Allow adding tags/metadata when adding a new connector

[roy-armis]

Tags are very powerful for smart queries, and i do see they are supported in chat, but there is no option to control creation of tags when i add a new connector.

i do see the Confluence connector adds a space name tag:

backend/danswer/connectors/confluence/connector.py

                    Document(
                        id=page_url,
                        sections=[Section(link=page_url, text=page_text)],
                        source=DocumentSource.CONFLUENCE,
                        semantic_identifier=page["title"],
                        doc_updated_at=last_modified,
                        primary_owners=[BasicExpertInfo(email=author)]
                        if author
                        else None,
                        metadata={
                            "Wiki Space Name": self.space,
                        },
                    )

and i will be really helpful to be able to add a tag manually for every connector.
Thanks!