Timeout implementation

## Current State

gRPC on Dremio would sometimes fail without returning any response. `DremioSource` would hang indefinitely.

## Proposed

Implementation of a `connect_timeout` the time allowed to make the initial connection and `request_timeout` the total timeout for the entire request.

@philippjfr , would that make sense?

The issue identifies DremioSource and the gRPC connection as the relevant entry points, but names no files or tests. Start by locating DremioSource and tracing the initial connection and request flow. Done means supporting separate connect_timeout and request_timeout behavior so a stalled connection or request does not hang indefinitely.

Written by the indexing model from the issue text.