User impersonation for individual connected account type

### Required Pre-requisites

- [x] I have read the [Documentation](https://www.aci.dev/docs)
- [x] I have searched the [Issue Tracker](https://github.com/aipotheosis-labs/mcp-gateway/issues) and [Discussions](https://github.com/aipotheosis-labs/mcp-gateway/discussions) that this hasn't been reported yet.
- [x] Consider asking in [Discussions](https://github.com/aipotheosis-labs/mcp-gateway/discussions) first

### Motivation

I want to configure the gmail mcp server with multiple users and I have a platform that is used to send emails.
Examples :-
If User 1 is logged in so email should be sent with his emailID.

Please let me know if apis are available to configure this.

### Proposed Solution

N/A