[Feature Request]: Support For "Proxy" in SSE and Streamable HTTP Client

[DebajitKumarPhukan]

Description

Request
Need support for http/https proxy in SSE and Streamable HTTP Client for scenarios where direct reachability to MCP servers is not possible.

References

No response

[ruhz3]

#1280
I think above PR can solve this.

[DebajitKumarPhukan]

#1303 meets the objective precisely.