Dynamically import echarts and three.js

[Gold856]

Description

This splits echarts into its own bundle to speed up the initial page load, and dynamically imports it so it's only loaded when a user navigates to the settings page. This also fixes an issue with the three.js dynamic import where the import was immediately awaited, so the page load was blocked on loading three.js.

old.mp4

Note the UI isn't displayed until after three.js is fully downloaded.

new.mp4

Note that the initial JS bundle is much smaller and three.js is loaded after the UI loads.

Meta

Merge checklist:

• Pull Request title is short, imperative summary of proposed changes
• The description documents the what and why, including events that led to this PR
• If this PR changes behavior or adds a feature, user documentation is updated
• If this PR touches photon-serde, all messages have been regenerated and hashes have not changed unexpectedly
• If this PR touches configuration, this is backwards compatible with all settings going back to the previous seasons's last release (seasons end after champs ends)
• If this PR touches pipeline settings or anything related to data exchange, the frontend typing is updated
• If this PR addresses a bug, a regression test for it is added