feat: add docs for SQL editor.

[billy-the-fish]

Add sql editor as a way of easily querying a cloud service.

[github-actions[bot]]

Allow 10 minutes from last push for the staging site to build. If the link doesn't work, try using incognito mode instead. For internal reviewers, check web-documentation repo actions for staging build status. Link to build for this PR: http://docs-dev.timescale.com/docs-3338-docs-rfcupdates-for-sql-editor

[MasterOdin]

I think we'll want to call out in the docs that you can disable the sql editor from the service management page. When disabled, can re-enable it from the sql editor page or the service management page.

[billy-the-fish]

@MasterOdin, done.