feat(editor-3000): integrate nav3000 sidebar

[EDsCODE]

Problem

• sidebar is just for show

Changes

• use existing sidebar component in sql editor

👉 Stay up-to-date with PostHog coding conventions for a smoother review.

Does this work well for both Cloud and self-hosted?

How did you test this code?

[posthog-bot]

📸 UI snapshots have been updated

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• chromium: 0 added, 6 modified, 0 deleted (diff for shard 1)
• webkit: 0 added, 0 modified, 0 deleted

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[github-actions]

Size Change: 0 B

Total Size: 1.16 MB

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Filename	Size
frontend/dist/toolbar.js	1.16 MB

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[Gilbert09]

Nice 🚢 Would love to get your opinion, but I think as a follow on from this, I'd like to see us drop the phrase "external sources" and instead just have "sources", of which PostHog is one. Im unsure on separating our sources and posthog tables under different sections - I feel like it makes sense to have all of this under one heading:

--------
Sources
--------
+ Posthog
  - events
  - persons
+ Stripe
  - customers
--------