Example of usage for custom-context-propagation in nodejs

[clndurnea]

Is your feature request related to a problem? Please describe. Currently there is no example (that i could find) of how to use the custom-context-propagation for nodejs https://github.com/open-telemetry/opentelemetry-lambda?tab=readme-ov-file#custom-context-propagation-carrier-extraction

Describe the solution you'd like An example of how this feature can be used.