Support integration with SDMX 3.0 proxy API

[kryachkow]

StatGPT Backend version

0.4.0

What is the problem this feature will solve?

We want to have access to SDMX 3.0 proxy for improved performance and specific statgpt analytics

What is the proposed feature or solution?

We should create additional sdmx client implementation to support proxy with sdmx 3.0

What alternatives have you considered?

No response