Add the px-mongo demo to the CLI
Summary: This PR adds a demo app to test the mongo protocol tracing feature.
Related issues: Closes https://github.com/pixie-io/pixie/issues/640
Type of change: /kind feature
Test Plan: Uploaded the px-mongo demo artifact to the GCS dev bucket. Tested the CLI and then deployed the demo to my cluster. Skaffolded Pixie with the latest mongo tracing changes and used the scratch pad to execute the mongo pxl script to verify data is being collected from the demo.
Changelog Message:
Adds the `px-mongo` demo to the CLI
One minor comment otherwise this lgtm!
I was able to deploy the px-mongo demo by following the demo README instructions and verified that the http_data and hand written mongodb_data script show the expected data. The only missing piece from my perspective is that the px/monogodb_data script hasn't been release yet.
@aimichelle @JamesMBartlett is there anything else you want to see addressed?