Add JSON parsing tool as part of webhook QuickStart

[chuck-alt-delete]

Documentation request

We should add steps:

• create a view that parses the json (use the json parsing shortcode)
• subscribe to view
• send data and see it arrive in the subscribe
• clean up (stop the subscribe and drop cascade the source)

Affected Pages

• https://materialize.com/docs/ingest-data/webhook-quickstart/

Related work

No response