[Sample Data] Add Canvas Workpad for Web Logs

[alexfrancoeur]

We introduced web logs sample data with #22276. We are also planning to merge Kibana Canvas with 6.5. I'll be opening a design issue shortly for SVG assets, but we'll technically need to add a workpad as part of the sample data set as well. Canvas workpads will be just another saved object but I'm not sure of how this would need to be introduced to the current implementation.

Prototype of workpad

Related to #21604

cc: @nreese @rashidkpc @jamiesmith

[alexfrancoeur]

@nreese I have a workpad that's ready to go. In a quick attempt to add it to the sample data saved object javascript file, I didn't see it loaded. I may have been doing something wrong. Any chance you could give it a shot? Also, I'm not exactly sure what types of tests should be made for the Canvas workpad.

https://github.com/alexfrancoeur/kibana_canvas_examples/tree/master/sample_data/web_logs/workpads

[alexfrancoeur]

Closing. Thank you @nreese!