v4

[lforst]

Collection issue of things that we may or may not want to do for v4:

• Flatten Eval() types as much as possible
• Remove exports for plugins (plugins == diagnostics channels consumers) (ref!: Remove plugins as part of public API #2386)
• Clean up exports in general (don't export anything that is 100% necessary; reduce exported types/interfaces to an absolute minimum - [ ] exported types that are simultaneously function inputs cannot be widened because someone may have done const a: SomeOfOurType = { ... })
• Add node engine requirements to package.json (feat(v4)!: Add Node Engine to package json #2378)
• Remove js braintrust cli (ref(v4)!: Remove JS Braintrust CLI #2377)
• Remove flue pre-v1 support (ref(v4)!: Remove flue pre-v1 support #2380)
• remove eve pre 0.34.0 support (added events) (ref(eve)!: Bump minimum eve version to 0.34.0 #2385)
• Remove unsubscribe functionality. It's barely used and a tad dangerous. (ref!: Remove plugins as part of public API #2386)
• Don't expose schema from SDK
• remove span sync async shenanigans

[github-actions]

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