[Currency] Remove the use of Spring REST Template

[mandy-chessell]

Existing/related issue?

No response

Please describe the new behavior that that will improve Egeria

The clinet-side REST API calls in Egeria are issued through Spring's RestTemplate class. This is deprecated and does not support calls such as HTTP PATCH needed for some integrations.

The calls are issued from a REST Connector implementation. The plan is to update/replace the existing Spring-based connector with one that uses the standard Java nio classes.

Alternatives

Carry on as we are, or use another library.

Any Further Information?

No response

Would you be prepared to be assigned this issue to work on?

No response