Document how to write a SQL integration

[bruno-garcia]

SQL integrations such as Entity Framework, Core Data or Room create breadcrumbs and spans (for performance monitoring).
The operations involved in such integration are documented: https://develop.sentry.dev/sdk/performance/span-operations/#database

The docs should mention:

• The query shouldn't include the value of parameters because those could include PII
• If a query can't be created with the parameter names, use ? as a value instead (what was done on Room)
• Optionally add the parameter name and value to data if sendDefaultPii is true.