Adds tracing support for ActiveRecord notifications

What does this MR do?

Adds tracing support for ActiveRecord notifications

This change will publish distributed tracing spans related to SQL ActiveRecord queries. These queries are unbound, so will still contain parameter substitution strings in place of actual parameter values.

This ensures that the SQL strings do not need to be scrubbed, since the values are not included in the SQL.

More details of rails instrumentation can be found here:

https://guides.rubyonrails.org/active_support_instrumentation.html

What are the relevant issue numbers?

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated via this MR
• Documentation reviewed by technical writer or follow-up review issue created
• Tests added for this feature/bug
• Tested in all supported browsers
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.
• Security reports checked/validated by reviewer