[WIP] Plugins: Load shared plugin dependencies on demand

[jackw]

What is this feature?

This PR attempts to remove the need for all the shared plugin dependencies to be available up front.

Why do we need this feature?

To reduce initial bundle sizes

Who is this feature for?

Everybody

Which issue(s) does this PR fix?:

Fixes #

Special notes for your reviewer:

Please check that:

• It works as expected from a user's perspective.
• If this is a pre-GA feature, it is behind a feature toggle.
• The docs are updated, and if this is a notable improvement, it's added to our What's New doc.

[grafanabot]

❌ Failed to run Playwright plugin e2e tests.

Click here to browse the Playwright report and trace viewer.
For information on how to run Playwright tests locally, refer to the Developer guide.