Create custom header for requests to access-node

[bthaile]

Issue to be solved
Need to track versions of flow-cli being used and failure rates

Suggest A Solution
Add custom header on requests to access node. header name FLOW-CLIENT and FLOW-CLIENT-VERSION

• library name
• library version

example for flow-cli
FLOW-CLIENT=FLOW-CLI
FLOW-CLIENT-VERSION=0.41.0

• Support GRPC as well.

[devbugging]

Are these metrics supported on the AN?

[devbugging]

Also, flow CLI uses Go SDK to access AN. We could add an option to add the header but then also that would only work on HTTP. I need to see the AN implementation first to do any action here.